[dharmab]

That makes me think of motorcycle foot levers, where the back of your foot is supported by and pivots around a peg, allowing you to comfortable and quickly push the lever down.

[lsc]

hm. Yes, and with a pretty significant (by keyboard button standards) amount of pressure required.

Actually, in a situation where I can't require significant force, the 'upshift' almost seems like it would be more comfortable.

[k_sh]

As a motorcycle rider, I'd prefer upshifting all day to downshifting all day.