I would like a command that puts jEdit into or out of selection mode--a sort of "toggle select." What I have in mind is that such a command would change the arrow, page up/down, and home/end keys to select (or not) text. In effect, if selecting were toggled on, these keys would act like their shifted versions. I could then assign a key to toggle the selecting mode.
The ancient Qedit editor had this sort of toggle--it was called "drop anchor." I think the Brief editor had it too.