Though this sounds good, it'd be highly exploitable.
Maps are set up so that as the survivors make their way through, they come across T2 or T3 weaponry. If I wanted to save my team in a more efficient manner, a team that's struggling to escape the spawn, say, then I'd simply sprint ahead, grab a T2 or T3 weapon, and wait for the plugin to teleport me back to my team with my new weapon in hand. I wouldn't even have to hazard the spawning special infected on the way back. The same goes for grenades and explodables.
If the plugin were to strip the player of his weaponry and medkit while teleporting them back, then it'd be a bit more balanced. Just a thought.