for example in elder, the player must control the key to access the tank which is placed at the center of the map, the opposing player has a to destroy a tank by repeatedly shooting it rendering the key useless for 200 seconds (tank spawn time)

is it viable?

i think its good for the balance of the gaem like in campgrounds the yellow armor will be transferred beside the red armor and a tank will be on its original place instead, this will give the out of control better chance to regain control