i figured out how to summon several sets of summons at the same time, talk about a killing spree lol. it is more of an exploit than a hack tho. it may be possible to use this method to figure out a way to maybe freeze your summons and then summon multiples at once
what i do know is that the actual summons status itself is all client side. here is a video as proof that multiple summons can be done without the server even being aware of it.