Gritty Realism Keys

For the second time in two days, this isn't strictly my idea. Anyhooo..

Make computer keyboards out of printable (for the letter names) coarse sandpaper-like material, such as the spray-on grit they use at climbing walls. Make the keystrokes sprung much harder so that you really have to go at the keys to get a letter out of them. Thus, roughen up your fingertips so that all those micro holds and features-only routes become more amenable to your otherwise office-worker-softy fingers. (the alternative is to boil your fingers in vinegar, I'm told) (or just cover your keys in sandpaper, but then you can't see what keys they are unless you never need to look at them anyway)