problem is that will hard to keep that guy alive, so much that can kill him.. maybe if you did a custom soldier, that has like no hitpoints, is totaly invisible but has the flag proxy, so you just see a flag move around... but the idea sounds great for those fightings, and you can actually make the area pretty large, like 100 meter and count the soldiers in that ring.. (thinking about fighting on the fields, hills and such), if you doing a urban mission 50 meters maybe better.. but really liked the idea.