Already done, of course. It was easy, as I had it remapped to Esc before anyway :) But using CapsLock as Ctrl makes it harder to press Ctrl-a and Ctrl-x, which are kind of essential.

Anyway, CapsLock is got to be the least useful key on a keyboard. It occupies a place on the home row, suggesting it should be as often used as Enter is... while it's decidedly not. I have no idea why it persists, it was useful on a typewriter, where you needed to apply significant force to press a key and doing so to two keys at once (Shift+letter) could have been hard, but today?