I think you can define in the BLB on what places other bricks could be placed.
Like the tele doors; how you can place a brick inside the black.
I checked the zone bricks and even I am clueless as to how the hell Melting Plastic made bricks plant 100% fine inside the brick like that
isWaterBrick = true;
Customize the brick grid inside the BLB file rather than resorting to hacks.