Suggestion to Spawner update part 2

ActivationRange is checking every direction of the spawn point. When building a multi floor cave we don't want to mobs from another floor spawn while no player in the same floor. Right now only options is we have is make other floor range is bigger then ActivationRange. Can we get a ActivationRangeY so we can control the Y of the spawner ActivationRange ? Like we set ActivationRange 48 and ActivationRangeY is 10 so mobs in another floor will not trigger to spawn.