[ffcmike]

This may have been requested before, if so it would be a good idea to bring up with V6 supposedly approaching.

If possible I'd like to see a function for:

addtiletype(x, y, width, height, tiletype);

This would work similarly to addtiledef2();, but instead of placing an image onto a tileset it would modify the tiletype within the specified area to your specified tiletype number.

This would make it much easier for applying custom tilesets of a fairly large size, usually you either have to include default tiles within them un-necessarily, or split them up into lots of different pieces and place over various different points of the tileset.
With this you'd simply be able to place a square of blocking tiles and a square of non blocking tiles anywhere not otherwise being used on the tileset via addtiledef2, then simply use the function to set your custom tilesets to the tiletype you want.