A program that runs on the background and either records or takes screenshots of last ~15 seconds of quakelive window. On key press it makes a gif if last 15 seconds that may contain a frag.

I think PCs today can afford seamless execution of a little program like this given that it records at lower resolution and FPS

This is good enough
http://i.minus.com/ibgCzFtfVj6tiu.gif