Sort of side question, but why do you set the command key to be Emacs' meta key? I've sort of waffled on that myself -- the plus to doing it is that it matches Windows (which I am in too much of the time) and Linux, but the minus is that it not only breaks 20+ years of muscle memory I have with MacOS, it collides with a few other global hotkeys. (Recent collisions I've noticed are Alfred's clipboard manager, which defaults to Shift-Command-\ (M-|, shell-command-on-region), and the system-level screenshot hotkey on Shift-Command-5 (M-%, query-replace).