cool idea, however:
#1 - you are not the first to come up with it.
#2 - unfortunately there are too many immature kids on jsp that like to get locked and/or scam
#3 - unfortunately there is people that like to scam and blame it on a keylogger.
#4 - it would need trusted tag's of course, and right now we need more mod's in the escl trade forums

voted no.