[Adam13531]

What's fun is that it's the only time when typing in all caps actually makes you feel like you're shouting!

But I'm not too sure how useful it is for efficiency even after practicing so much with it; there are a lot of false positives and negatives since keypress velocity doesn't matter for regular typing. With enough data, you could figure out a specific velocity threshold for each key so that you make fewer mistakes, and then maybe it'd be more helpful.

[ordu]

If you make a responsive keyboard, which would give a different tactile sensation for CAPS and for lowercase, then it would be easier. Piano gives this kind of distinction, historically it was due to a mechanism behind "FortePiano", in a modern electrical piano it reproduced for a convenience.

It can be made in a mechanical way, like a tristate button -- off, slighly-on, on.