[Feature Request] Run a new command when keeping pressing one hotkey.

[zw963]

Hi, Thanks for you guide-key, It is very pleasure use emacs with it. (So many binding ...)

And, I need a new feature, following is simple describe.

1. When I press M-f, And release at once, invoke next-word.
2. repeat M-f, It behavior as usual.
3. When I keep pressing M-f more longer, e.g. exceed one second, I hope
   it could run another command. (e.g. jump-char)

I think maybe exist some package do this ... though, I could't search out from google.
If you know, could you please told me? or, consider create new package do this?

Thanks.