Custom Tile Types
 

I think it could be useful if a Type 2 tileset option were added that supports custom tiletypes. (Types 0 being the default Graal, and Type 1 the more organized one).
Tiletypes could be listed in a text file using hex values and supplied as a parameter to the script:
addtiledef(image,prefix,type,tiletypesfile);
It would be useful in changing parts of the default Graal tileset to support new tiles without having to create a type 1 tileset if you run out of room.

The Tile Types would have a list of the hexes where you could also add flags for a certain tile: 'block' 'water' 'shallowwater' 'lava' 'hurtontouch' 'liftable' etc.