finally got around to setting up drracket comment and uncomment to cmd-; and cmd-shft-;

keybindings.rkt

#lang s-exp framework/keybinding-lang

; taken from drracket docs
(define (rebind key command)
  (keybinding
   key
   (λ (ed evt)
     (send (send ed get-keymap) call-function
           command ed evt #t))))

; rebind comment and uncomment to d-; and D-;
(rebind "d:semicolon" "comment-out")
(rebind "d:s:semicolon" "uncomment")