You're fine with 12 min quarters. I run 15 to get realistic Time of possession. As long as you use over 10 mins. If your scores do become too high in more than a couple games I would use 10 mins and go with your team. Why not? Makes it more fun. I always use my Cowboys. I have done a franchise where I try rebuilding a bad team like jaguars (even though they're going to be good this year) and I limit myself to only one trade and in that trade I go and get my favorite player from Dallas (Dez Bryant). I've also done a franchise where o pick a bad team to rebuild and I relocate them and create a whole new team name and stuff.