Win points are going to do what?
Stop people for maybe a week or two, you need a broader idea which will stop laming for a long period of time. E.g. Spawn at random spots, spawn where team mates are and etc.
How about a head hunt game? You have one person per team as commander and you have to target that person, first team to eliminate the opposing teams commander wins
That will mean team work is necessary if you have a team of 5+ unless you got some freak playing ><