It has often happened that people suddenly go AFK for a long time in the TTT server. First of, it's really annoying as when they turn traitor you have to wait for a long time till the innocents has found out who the traitor actually is (an afk). And secondly, if you kill the AFKs you'll get killed too most of the time because you killed someone that was innocent but he was AFK and you'll never know if it's a traitor or not untill you kill them.
And third, they go AFK in the server for a long time which makes it unable for some people to connect to the servers because it's full (Not that it matters for me anymore hehe). The AFK's keeps a slot and aren't making any space for new people to join. Therefore I think a AFK kick system is more than needed on TTT. Generally because it's a waste of time when they turn traitor.