I worry about the idea of gestures, because they'd be a bit like macros on functions I use a lot; fine on this PC, but I'd be dead if I moved PC, or used another one regularly.

Plus, I'm a clumsy oaf anyway. I currently regularly browse via four different PCs, if anything that'll go up rather than down, and some of them are occasional/never uses. So I'll stick to not using them, I think.