In my Emacs 23 default configuration, the functionality for editing code and comments side-by-side in separate buffers is on the F2 key, whereas replace-regexp

In my Emacs 23 default configuration, the functionality for editing code and comments side-by-side in separate buffers is on the F2 key, whereas replace-regexp doesn't have a key of its own. Guess which one I use more. Sometimes I wish for a keybinding revolution... Yes, I know that keys can be remapped, and have done so on my machines, but sensible defaults are still a good thing to have, if only to welcome new users.