Word-Request – Idiomatic Terms for Parts of a Fruit: Stem and Stigma

For most equipment they are called feet, but in the laptop context, add-on feet may be called bumpers or stands (1, 2) as well. Phrases “self-stick rubber pads” or “stick-on rubber pads” also may be used for particular kinds of feet.

The word typical is, I think, ill-chosen here. What the writers are saying at 122.2 might be better expressed thus;

We often use can to signify that an eventuality does occur—not always, not necessarily even usually, but from time to time.

At 339.10 there are really two different uses which should be distinguished:

May is used, particularly in academic and scientific contexts, to signify that an outcome is possible but not necessary:
Children of divorced parents may have difficulty with relationships.

May is also used in academic and scientific contexts to describe a range within which possible outcomes lie:
A female crocodile may lay 30-40 eggs.
The flowers may have five or six petals, pink or red in colour.

Either of these may uses can be expressed with can in colloquial registers. Colloquial can has largely (but not entirely) replaced may.

And (as you doubtless know) these do not exhaust the possible uses of either may or can.