First of all, put more explanation on the forums... this is a little vague.. good thing you posted a shout. You can only set one type of score for an Assault game... so you can either do touchdowns or fieldgoals... I'm guessing you will probably do touchdowns...
Euro-football, or American-football? I wish you could use the balls passing through checkpoints as a scoring mechanism. The show up radar, after all. I'm trying to do something similar, but I think I'm going to have to end up using players on vehicles as the 'balls.'