Well, the keybindings on emacs predate most other keybindings. I don't use it very often, but Cmd-F is forward-word, to move forward a word (heh.) For keyboards without arrow keys it is very handy (my oldest laptop didn't have them.) Cmd-R I have never used its binding (so I could rebind it, but what binding would you like to have in it? "Reload"?