Maybe this is a stupid question,
but I have to ask this as my provider addressed me, very unpleasant :-(
Is it possible to run Bitorrent through tor
Yes it is.
and can I disable it on an
exit-Server?
In practice,no, at least not via exit policy(port blocking). You could limit it's usage to (almost) zero if you ONLY allow ports 80 and 443 (Bittorrent clients _usually_ use other random ports for communication)