Some quys have thought about new kind of mp map. Its hard, but I get a "flash" in the night.
What about a mp mission, B&D Build and Defend. In this mission, both sides will build their own defences with script, I son't remeber, but I know that that kind of script is in Alamo mission. There should be mg:s, AA, minefields, sheds... When they are ready, building options will disspear, and another human team will attack, trying to break trough.
After that, attacker will change to defender and defender to attack, the side what get most scores will win, you will get extra point from breaking truogh the enemy lines.