I agree in principle, but no "tertiary" and "smart" drags please. They
would confuse the hell out of both users and developers. Please go on
with your change, but please keep the old names for things. They are
learned in a lot of brains and documented in a lot of texts. Let
Alt+click remain Alt+click, which is the name world knows it under,
even if you will allow some other levers or appendages to emulate it.