when i demote a player to a lower rank it would be nice to have and option to enforce his new limits by disabling never "above limit stones", protection fields combined with more than the new limit stones should shrink to the new combined block protection limit (the best way to do that is to shrink 1 layer from the ceiling, then from the floor, then from N... E,S,W and again till the limit is reached)

you can check if the users stone limit has change on join

Way too complex to do this

how about just disabling above limit stones and if there are some combined just reset them to the standard, non shaped size?