Xing:
What if cin-gg were to make use of "mouse chording"'. For instance, to
perform a "slide", the user can hover over a clip, hold down button1,
follow it up with button2 then drag. Something like
http://acme.cat-v.org/mouse but for video!

This is an intriguing concept!  Something else to think about -- always need more shortcuts.  Thanks for bringing this up.