OK, I don't think there will be a fix for TTT for a while, so in the mean time I would suggest removing the non-playable maps from the voting list. There are only a handful of non-TTT maps that work, but people still vote for the broken ones.
As for karma, I'm sorry, but it sucks on these servers. I spent nearly all day trying to get my karma back up from
90% reduced damage to 30%, and then I kill one innocent cause they shot me...and I am back down to 90%. I'm sorry, but there is no point in playing in your servers if my karma is going to go down so dramatically and take all day to recover, and not be able to do anything excepted to be killed. I know the purpose of karma is to sorta punish for being wrong, but this is ridiculous. And I'm not the only one that is complaining about this, I'm just the one that did sign up for the forums (though I thought I was already, unless you moved the forum).
I just wish it wasn't as harsh, or reset at the end of each round.
So these are my two suggestions, take them as you see fit.