"Eye-glazing" isn't that common at all. "Eye glazing over" is certainly used, as in "his eyes glazed over". In your main example, the person is commenting on "one of the least-interesting paragraphs" you have ever read, and he is saying, "ok, after these very boring paragraphs, it gets less boring(eye-glazing)".
The term "eye glazing" is usually used in the sense that the person is so bored that his eye glazes over. Also, the "The Burglar on the Prowl" example has the same meaning of boredom.
But is this common? Is "eye glazing" common usage? Taking a look at an Ngram:
By far, "glaze over" is used the most, whereas "eye glazing" although it is used, is not that common.
Perhaps that's why it isn't included in most dictionaries.
It's a cultural thing. Even though most dictionaries probably wouldn't include hissable, I don't think most native speakers would find it a particularly odd word in OP's context.
Hissing at the villains is probably more associated with pantomime audiences, but it fits perfectly well here. Even though I doubt I've ever seen the "word" hissable before, I'm sure I pick up exactly the intended meaning. It describes an exaggeratedly despicable character in a tale, someone the whole audience can unite in booing and hissing at.
OP should note that adding the -able suffix is a perfectly standard operation in English. Not all such forms will be listed in dictionaries (this one presumably not). Nor will they all be widely accepted, but I think this one would be. It's not a neoligism, just an uncommon but acceptable inflected form of an existing word.
It's also important to note that just because hissable is an acceptable adjective for bad guys in panto/cinema, that doesn't mean it can necessarily be used in any other context at all. Here are over 1500 written instances of the word. Just glancing at the first page or two, I see the word villain a lot, and all references seem to be about fictional antiheroes.
Best Answer
Rather than starting my inquiry by looking directly at disabilitated, I decided to do some research into the term disabilitation, on the theory that if the latter word exists, the former word is almost inevitable.
The old (and young) history of 'disabilitation'
A quick Google Books search turns up several matches for disabilitation in published works. The word is not used consistently in all instances, however—as you might expect, given that the few occurrences are spread across almost 400 years.
The earliest match is from the legal case of Finlason contra her Tennents (July 27, 1626), reprinted in The Decisions of the Lords of Council and Session, in Most Cases of Importance Debated and brought before Them; From July 1621 to July 1642 (1690):
In this case summary, disabilitation is used (twice) as a legal term of art, with a meaning along the lines of "disabling of (or causing to forfeit) a right or possession." A more common term for such disabling in property law might be dispossession.
About 174 years later, Alexander Geddes, A Modest Apology for the Roman Catholics of Great Britain: Addressed to All Moderate Protestants (1800) uses the word twice in the final paragraph of the preface:
Geddes's subject was the prospective repeal of "disabilitating Laws" that severely limited the civil rights of Catholic citizens of Great Britain. The difference from the 1626 Finlason case is very large because here the issue isn't loss of property but loss of various freedoms common to all other British citizens of similar situation (aside from religion).
In any event, the next Google Books match for disabilitation arises 208 years after Geddes's use of it. From a bibliography entry in Kristin Lefebvre, Racial Variation in Level of Amputation Among Individuals with Vascular Disease (January 25, 2008):
Evidently, Disabilitation Rehabilitation is a periodical that in 2008 was in its 26th volume of publication (which is normally equivalent to 26 years of publication). IA Google search turns up citations to volumes 22, 27, and 29 of this periodical, but nothing more. On the sketchy evidence here, it would seem that disabilitation is being used to signify something like "state or process of being or becoming physically disabled."
The final Google Books match for the term is from Lucilla de Arcangelis & Hans Herrmann, "Activity-Dependent Neuronal Model on Complex Networks," in Scale-free Dynamics and Critical Phenomena in Cortical Activity (2012):
Here disabilitation seems to have no more technical or specific meaning than "disabling." It's difficult to see what the authors have gained from their word choice beyond a specimen that is five letters (and two syllables) longer than it need be.
The recent emergence of 'disabilitated'
A Google Books search for disabilitated finds ten matches for the term—one from 1974, one from 1997, and the rest from 2001–2015. Even within this relative small window, usage of the term is by no means consistent. I'll review the main tendencies in usage here.
First, from Nancy Joyner, Aerial Hijacking As an International Crime (1974):
The meaning of disabilitated here is something like "undercut," "weakened," or "rendered ineffective." None of the other nine instances of the term in Google Books matches follow this would-be line of usage.
From the discussion of R.J. Davies & G.K. Knowles, "Antibiotic Treatment of Chronic Bronchitis," in Developments in Antibiotic Treatment of Respiratory Infections: Proceedings of the Round Table Conference on Developments in Antobiotic Treatment of Respiratory Infections in the Hospital and General Practice, held in the Kurhaus, Scheveningen, The Netherlands, June 15–16, 1980) (1981):
Here disabiltated seems to imply an advanced an extremely serious level physical debilitation; perhaps the most mysterious thing about the word choice is the question of why Dr. Gould didn't say "grossly debilitating respiratory crumble," since that seems to be the sense of the phrase he was after. Since these were spontaneous remarks, he may have got caught between disabled and debilitated and ended up with disabilitated as a portmanteau of the two.
From Jan Keene, Drug Misuse: Prevention, Harm Minimization and Treatment (1997):
It's tempting to read disabilitated here as a portmanteau of disabled (physically and psychologically by substance abuse) and nonrehabilitated (because still in the grip of addiction)—that is, as a word that might more appropriately be spelled dishabilitated. On the other hand, it wouldn't be unreasonable to infer that Edwards is simply grasping for a fancier way to say "disabled" (whether from dependency or other causes).
From Craig Paterson, The Contribution of Natural Law Theory to Moral and Legal Debate Concerning Suicide, Assisted Suicide, and Voluntary Euthanasia (2001):
Disabilitated as used here seems to mean "severely and perhaps permanently incapacitated, to the point of being unable to survive without mechanical assistance."
From Jennifer Davis, Her Kind of Want (2002):
In this novel, disabilitated seems synonymous with "enflamed," "flooded," or "overran." There is no sense that he is actually disabled in any normal sense—indeed, the author reports that in the resulting passion, "He'd dance around the Mustang like a revival preacher, his curls icicle sharp with sweat, his index finger sharper, pointing at some imagined audience, while he sermonized on the horrors of corporations." The author could very well have replaced disabilitated with inspired without misleading her audience in the least.
From the opinion of Lord Mance in the House of Lords, "In re Deep Vein Thrombosis and Air Travel Litigantion" December 8, 2005, in Encyclopaedia of International Aviation Law (2013):
Here, much as in the 1981 instance, disabilitated seems to mean suddenly and gravely disabled.
The remaining four matches for disabilitated that the Google Books search returns are from 2009, 2012, and 20015 (two different books). In these matches, the meaning is much more consistent— and it more or less corresponds to disabled/debilitated/incapacitated (again, as in Dr. Gould's remarks from 1981), though it may suggest that an unusually severe disability is involved.
From Claudia Osborn, Over My Head: A Doctor's Own Story of Head Injury from the Inside Looking Out (2009):
From Stephen Sutton, Full Circle: Looking at the World Through My Eyes (2012):
From Anca Sarb, Stelian Brad & Ovidiu Stan, "The Innovation in Design Management of Buildings," in Proceedings of IAC-MEM 2015: International Academic Conference on Management, Economics and Marketing in Budapest, July 10–11, 2015 (2015):
In this example, disabilitated seems to have grown directly out of the noun disability, as if the authors were unaware of disabled as an alternative.
From David Peckham, 101 Thoughts from the Word (2015):
Conclusions
The word disabilitation has existed for centuries—first as a legal term referring to dispossession of property and (subsequently) to loss of civil rights, and later (long after the legal meanings seem to have vanished from the scene) in a medical context in connection with physical disabilities and/or the disabling of physiological processes. It remains rare in both contexts.
As for disabilitated, it's a word, too—indeed a more popular word (to judge from Google Books match frequency) than the much older disabilitation. The most problematic thing about disabilitated from a reader's perspective is that it seems never to have been comprehensively and coherently defined. As a result figuring out which of the many of the meanings it seems to have carried in the past is the one an author intends in any concrete instance of use.
The most frequently intended sense seems to be a compound of equal parts "disabled," "debilitated," and "incapacitated." But other meanings that would suit particular contexts where the word has occurred include "vitiated," "unable to overcome addiction," "inspired or filled," and, simply, "disabled." Perhaps the main point to take away from this discussion is that when you are flirting with the idea of using a word that is unfamiliar to the vast majority of English speakers and doesn't appear in most dictionaries of English words, it might be wiser to replace that term with more-familiar words that are likely to convey your meaning more reliably.