Usually they dont allow rapid firing either.
Id take not being able to yell "suck it popo!" as a tradeoff for emptying a mag at will.
Range by me has a sign "cannot bring your own targets that have likenesses of real people or presidents" or something to that effect. I always ask "so we cant bring our own, does that mean you have them already?"
loved the last time I went to the gun range to qualify.. we had 9mm, M-16 and pump shotguns.. when everyone was done, we finished up the last of the M-16 ammo by going full auto.. (probably had about 30 magazines to shoot up, didn't take long)