RE:
Pause button?
The only legit concept of a pause button I can think off, is having you keep your mouse on a window open on the site to keep the pause active, so you cant just minimize while paused and keep working.. if that can be done.. hmm.. meh.. or a cooler idea would be just to prolong the session as you go.. for instance you have a great idea, but run out of time, you switch to longer session on the go..