Shaping tor exit relay traffic?

[senser]

I am thinking about running a tor exit relay on my firewall but only if I can effectively shape the tor traffic.
At best, I'd like to be able to distinguish my personal HTTP traffic (source: LAN) from the HTTP traffic initiated by tor.
At least I'd like to be able to put all tor traffic (and only the tor traffic) into it's own queue.
Has anyone done this? Thanks