You want team deathmatch?? Try these settings..

Make a custom private...
Make the game have 30 mins and 20 mins overtime.

Turn buying everything off

Game will have less lag and you can kill as many pros as you want and let the game drag on.

I hosted a private yesterday and it was pretty epic even though the teams were unbalanced by 6 on 5.

Give it a shot if you got a party of 8 people all wanting to play.

It basically turns into death match and the lag decreases without the extra options.

5v5/4v4 is the best without lag i found.

Sounds like fun.