I would have to agree with the limit thing. I have been running toons 1-2 at a time now since my purchase, but now that my 1 new toon is xping in Fields of Massacre with 19 other toons running in the same exact spot it makes it a little difficult.

I don't know if limiting the amount run at once would work but varying the hunting grounds slightly like you did in Den of Evil. I think that would be better, there is more than enough hunting area for all of us to enjoy this without limitations.