Gatehouse steps not friendly to custom walls

[AnvilPuncher]

Hi,
The steps in the walls that are created when a walled city wall intersects its street seem to simply modify the metadata of a needed stair (or slab?) This isn't really compatible with walls that are too short as to need a wall_stair. It also causes some oddity when using a modded block to build a city wall out of like in this picture.

Thanks