Benevolent keylogger for "instant replay" undo of mistakes?

[gomipile]

This would be a fairly simple task for a AutoHotKey script, and sure enough, Google reveals several AutoHotKey scripts which effectively dump your keystrokes to a logfile.

I guess they could be modified to add keystrokes to a string and periodically (every five minutes or so) move the contents of the string into a set of buffers, with the buffer at the end being the twenty minute-mark buffer. Then a hotkey could be set which would regurgitate the contents of the buffers into the clipboard.

How are you with programming?

I guess to have it work the way I asked, I'd have to set up a RAM disk for the logfile? It's too bad there'd be no easy way to have it auto reject logging user names and passwords, though.