Thanks for the updated mod!
I'm trying to mod the game myself, sadly I don't know how to repack my edited textures into data.unity3d, Ive tried UABE, AssetStudio, yet I can't seem to find the way to import a file back in.
Any help would be greatly appreciated!
And thanks again for the mod, it works flawlessly to this day still.
EDIT: I managed to do it
For those with the same problem, Unity Asset Bundle Extractor (UABE) is all you need to export/import tga or png images. The trick is that there are no explicit way to import back an edited image, you need to select your image (e.g:Atlas9) and select plugin->edit, then select "load" at the bottom of the box, and boom you can import your image.
Be sure to save your changes and compress the file you end up with (about 1.5gb in my case).
Note that the current build of UABE may be unresponsive when trying to compress a file, I had to use a previous version for it.