You could do a King of the Hill arena where everyone can shoot everyone. All fields can be captured. And the last man, or group, or squad standing with some number of fields flips the map. Eminently abuse able but, squads may have an advantage entering the arena.
And making alliances would be an interesting skill set. So to you would need a way for everyone in your current alliance to make their icons the same color. Possibly a mechanism where accepting joining the alliance you get the same color icon and loose the ability to kill anyone with the same color icon. And any fields you have captured turn your icon color on everyone's maps to denote your territory.
So if you put together a hoard and capture a country or territory, it will need a general and staff, then the war winners could war away to win the map. And the skillz ACMists, HO n Run griefers, and spawn campers can harass them to their hearts content like little circuses, partisan groups, rat patrols and terroreestas.
Now all you would need are some trolls, dragons, and a few dungeons full of fur bikini babes to rescue.
