Ability to put regions in region groups making it possible other regions/movables interact with all regions in group at once.
As an example , i need to make "charging gun" that "shoots" a moving region that will or will not pierce through solids(that have regions so if the charge level is not enough they will "remove" movable away) but making a separate region and a trigger for it for every solid will possibly cause lags or at least make insane amounts of triggers.