Folks, making a plug here.
Try RotoWire.com comissioner's service to run these leagues if you need more options than just Yahoo. We've got more categories, setup options (head to head, points and roto) and most importantly - retroactive transactions. That way if someone misses a deadline, you can set things the way you want.
Test it out for free at:
It's just $69.99 per league.
I'd love to respond to any questions.