Basically, a new vehicle in PB2.5. I know you can already create turrets with triggers in PB2, but those are automated, and you can't take control of one unless you switch over to the turret character.
How it would work is it's a stationary vehicle. You put it down (in the level editor), and it won't move. What I have in mind is something like this:
When you "enter" the turret, your character switches to their slot 0 (to free up their hands to man the gun), and you take control of whatever gun is attached to the turret. The turret can be given any one weapon, regardless of whether or not it's a weapon for vehicles or for characters, and use it until they decide to get off the turret. Because it is a mounted gun, the character controlling it can be killed. When the turret is destroyed, it will drop the gun. All characters can use the turret regardless of the team(s) the gun is allowed for, but when it is dropped, only the allowed teams can then pick it up. For example, if a gun on the turret is allowed for only Civil Security team, all characters can still use the turret, but when the turret is destroyed and the gun falls off, only characters on team CS can pick it back up.
Anyways, this is just an outline of what I want this thing to be, but obviously it may have to be modified so that it can be implemented into the game.