Multiple activations between wardens

I was wondering if there were a way to lengthen the required number of activations between warden summons. Right now, it's three initial shreakers, and then one each after those. Could it be expanded to 2-3 extra shreaks per summons? That way, if some friends are going down into the deep dark and someone accidentally summons a warden and then survive, they have more chances to carefully work their way around, rather than no more chances.