[anyfoo]

Good point. Though C-s is fine unless you have software scroll control enabled, and it's used in emacs and anything that follows its key bindings very often as well for incremental search forward. (It's not used in the shell even though that typically implements emacs bindings, because there you usually want to incrementally search backward, i.e. C-r.) I think C-z is the perfect candidate for the reasons you mentioned.