So the DMAPs total is like 511, but the total map count itself is only 255.

I would really appreciate a larger total map count, to also 511 maps.

The quest I am working on has a 18 map grid with 9 layers a piece for each map for a total of 162/255 maps already used up for just the overworld.
I wanted to make an underground of the overworld also, but unless I limited the layering to much much less for the underground I would not be able to do so with only 255 maps. I am already at <100 left for dungeons/houses/etc.