Nice idea with the smaller team but with a 'special' object in there control, and maybe the team has to choose one player to operate this? Obviously not a full control, but maybe something such an ability like in Huttball, so they can, in your example with a turret, target objectives and enemy players? Maybe thats abit OP if they can target enemy players, but all ideas.
Also would like to see competitive Huttball, add some new venues for it though, otherwise the same place would get abit repetitive, especially in a competitive community.