I don't know if it is a glitch or deliberate, but it does seem a bit unfair to remove one perk. Not all players are fast enough or have great reflexes to enable a sustained run and gun game style. So camping with a sniper on a rooftop is an accepted style, so long as its not spawn camping. And clays are an accepted part of this mode. Sure its annoying but its also annoying being tubed, naded, stunned, knifed. And once you trigger a clay you usually know where your target is hiding.
Just my two cents, but by removing the perk you seem to be forcing everyone to the same style.