I was thinking that perhaps 60 or 30 seconds before they are autokicked, it opens a derma panel over evrything else that says "You are about to be kicked for being AFK! If you're there, hit this button." And the player can simply click the button and the timer resets, otherwise they get kicked would be a bit annoying, but it would be easy, and heck I could probably do that if I looked in to it a bit.