My time pressed tofu draining method is the microwave.
You slice it into the size pieces you wan then there are two different ways I have used:
1) Microwave it for about two minutes. Water leaks out onto the plate, which you drain then microwave it for a couple more minutes. Keep doing this until it stops leaking out water.
2) Microwave once for three minutes then place over a colander to rain.
The multiple time method works slightly better (more through draining) but once plus draining is easier.
1- Is this a valid approach and I should just add a lot more of my
flavoring agents?
Yes, you can make additions to your curd prior to pressing/knitting just like with cheese. Adding bits of dried peppers ala pepper jack cheese sounds like a great idea. The main concern in this regard is to avoid adding so much adjuncts that the tofu curd fails to knit together during the pressing/draining phase and falls apart as you're handling it during subsequent cooking.
A secondary concern is that tofu generally weeps significantly more water than cheese curds. And since you've added your adjuncts already, part of the flavor of those adjuncts will run off as the tofu curd weeps. The only real suggestion I have for that is to use assertively flavored adjuncts.
2- Are there other flavoring agents that will present themselves more
forcefully (and pleasantly) in tofu?
Soy beans have fat in them. The fat in the beans becomes emulsified in the milk when processing the beans into soy milk. The majority of that fat ends up in the soy curd when curdling the soy milk. The majority of the fat in the soy curd will remain in the curd during pressing/knitting into tofu blocks.
You can use this to your advantage. When grinding the soy beans into milk, you can fat based flavoring, some of which will end up in the soy milk, some of which will end up in the resulting curd, and thus into the tofu blocks. If your fat based flavoring is particularly intense, then it should be noticeable in your tofu blocks. A common type of intensely flavored (aromatic) fat based flavoring is essential oil. You can add essential oil of lemon or orange and that flavor will certainly carry through into the final tofu blocks.
3- What easily accessible bacteria would be able to ferment soy curd
in a pleasant way?
Fermented tofu/bean curd has been made for centuries. There are number of fungii strains commonly used to ferment bean curd. There are likely many other bacteria that could be used. Lactic acid bacteria could feasibly grow in tofu/bean curd, though I'm not sure a sour tofu is something I'd personally enjoy.
Aside from blocks of tofu/bean curd, there is also a long history of fermented products with amazing flavor that use soy beans but not in a curd/block form. There is tempeh, soy sauce, koji, miso, etc.
Best Answer
The purpose of this liquid is to prevent the cheese or tofu from drying out. Its main use is for storage, not for consumption. If you don't consume the cheese at once after opening the original package, you are supposed to transfer the liquid into a storage container, or replace/fill up with water.
There are people who drink the whey, because they like the taste. There isn't much to be said here; they pour it into a glass and drink, without further preparation.
Otherwise, any recipe which uses water can use whey instead. The taste difference for mild wheys such as mozzarella and tofu whey will be very slight, almost unnoticeable. There is nothing special to take into account, except a small probability that you won't like the taste and would prefer to use water instead. There is no way to predict whether you will find the taste harmonious: it is a personal preference.
A known use for the whey created during cheese making is to make ricotta. It will not work with tofu whey, and I don't think it will work with the liquid in commercial mozzarella packaging either; you'd have to make your own cheese to get the necessary type of whey for ricotta.