make it an option as that guy up there said
good:
-will stop brothers/sisters from tampering with the RC and possibly disconnecting it (happened recently on delteria)
bad:
-sudden disconnection when busy doing X and losing all of your work
-If no admins are there people will try and "hack"
I'm sure there are many more good and bad reasons... it should be up to the person on RC to make the decision if they want to be disconnected when idling
if you cant trust your brothers/sisters then this would be a great thing (though you can setup your screen saver to lock when you idle)
well anyway, whatever it should be an option... not too hard to do either