I've gone further to support meta-keybindings for whole-word movement. Control-b goes back one character, option-b goes back a whole word. It's really easy to add and customize:
http://www.hcs.harvard.edu/~jrus/Site/Cocoa%20Text%20System....
http://www.hcs.harvard.edu/~jrus/Site/Cocoa%20Text%20System....
M-b and M-f work sometimes too, but these two get intercepted for ∫ and ƒ respectively in Slack, Firefox, etc.