I use Kensington Pro trackballs (four buttons with a scroll ring). I use them on Mac OS and 9front currently as my primary machines, and they're useful with bo

I use Kensington Pro trackballs (four buttons with a scroll ring). I use them on Mac OS and 9front currently as my primary machines, and they're useful with both the sam and acme editors, as well as all throughout Plan 9/9front. Chording for cut/paste, and running commands from the mouse is very fast if you've got complex things to do. I think if I could get a reasonable chording keyboard (like Douglas Englebart demo'd or in similar spirit), I'd probably find ways to use that as well.