I feel as though calling it "capture the flag" implies that the flag spawns at the beginning, and that capture the flag, is indeed, the sole purpose of it. My suggestion is making it so that the first 2 to 3 minutes (assuming a 5-6 round time limit), IS still battle. My suggestion is to then give the surviving combatants a place to converge and finish the battle. Besides, capture the flag was already implemented for a short period of time in it's Classic form. That being, 2 flags, 1 team has to grab the other, and return it to their flag for a point.