I'll definitely look into this. Sorry for making you you guys press hilarious keyboard combinations! I'm astonished you even figured out double-shift. =p

I'm using Chrome on Linux and I have to hold both of the shift buttons for it to work. It would be utterly impossible if I wasn't using a trackpad.

I'm not seeing anything interesting from shift+mouse either. Google Chrome 8.0.552.224, Ubuntu 10.04.

Edit: As mdda points out, it works if I hold shift and control simultaneously, pushing shift first.