[ikurei]

Sadly, that isn't as powerful as what our comment-ancestors do with Karabiner. Such an accessible and prominent key as Caps Lock is, IMHO, wasted if only used for ESC; using it both for Control when in combinations and ESC when alone makes the most sense.

I use Caps Lock for Cmd or Ctrl, depending on which keyboard I'm using, and <Leader><Leader> for Escape on Vim.

I don't know where I got this idea from, but I also use <Leader>w to exit to normal mode and save. It's so ingrained in me, that when I use other editors very often I have "Unexpected token" errors because of a ",w" in the middle of the code.