I see a bunch of people saying "Oh but, my alt classes! I want to queue tank to get in quick, get through easy and get gear easy! Who cares if gear no one needs drops to the floor!" Just wow people. You want gear for an alt class? How about you actually play said class to get your gear? I have gone through CTs where not a single drop was looted on, and that's just pathetic. Making everyone else's time more difficult because you want to be lazy is disgusting.
Or here's a thought, how about you put your own party together? You looking to greed caster drops? Make sure you have a caster in your group.
I'm all for OP's idea, the only downside i can see is that CT partyfinder groups may alienate certain classes in order to have better chances that certain gear drops. Even then there's always duty finder, or you know, you can start your own PF group.