This just in: added support for converter from and to landscapes as well.
What's more, I've made a refined algorithm for adding a third parameter to each replacement that lets you specify a transfer mode, e.g.: convert all landscaped textures in the water collection, bitmap 8 to the "space" landscape. Basically, with this setup, you can choose a few textures per set as the ones that will bring in replacements from the other sets. For example, you could specify things like this:
Water Collection:
Bitmap 0 will be replaced by Lava textures
Bitmap 1 -- Sewage textures
Bitmap 2 -- Jjaro textures
Bitmap 3 -- Pfhor textures.
Then, you could set things up so that the 11 transfer modes available in Forge represent a different texture in that set, so:
Water BMP 0:
Wander -- Lava BMP 2 normal
Wobble -- Lava BMP 6 normal
Etc.
So this means, in the example above, that (assuming you didn't care about any of the transfer modes for the first 4 water bitmaps) you could have an extra 44 textures swapped into the map.
This is a pretty easy way to mix and match without too much trouble, and remember that we're going to add an XML parser so you can set something like this up for long-term use throughout your mapping. I'm excited. Are you?