reflecting team damage would solve it imo
Automated script to delete your character after any TK would also solve it.
The idea is not finding a solution, but a good solution. Reflective teamdamage always feels like silly magic mechanic which detracts from the feel of the game. Also, it is exploitable by trolls and such, and soon we'd be having threads like "ban XYZ for jumping in front of archers" and would need rules like "intentional jumping in front of friendly weapons is forbidden".
And really... before you try to find solutions, you've got to ask whether you in fact have a problem. And I'd say we don't, really. There's the odd troll who TKs intentionally which deserves a ban, the odd rage TKer, and of course, accidents which happen from both someone being careless with swings/shots, from people being killhungry maggots which have 0 situational awareness and charging into teammate's swings.... and of course, pure accidents because of ethereal corpses, etc.
Aside from people who repeatedly do intentional TKs, and who get banned anyway, I don't find there are any problems to "fix" with reflective damage or something of the sort.
As for this thread and the poll... well, do we seriously need the sort of admin who is going to be butthurt for the next three months because 49.5% of the people (who are by his statement all voting for "wrong" reasons) think he shouldn't be an admin? Why can't you be like normal admins who don't argue with players, only kick/ban people when someone is obviously in the wrong, and in general you don't notice an admin is there until someone is actually breaking the rules? Nobody is polling them for a reason. Stop being a damn drama queen.