I love this tool so far- I think it has some huge potential with the Texture Ripper part for sure. I was going to use it with my Project Zomboid mod 'EasyPacking' for build 42 support. However I found a gap in what I'd use it for.
What I would use it for is: I have a bunch of textures, and models. The models were made with native zomboid textures versus my own. I would love to be able to see the 'UV mapped' areas so that when I rip a new texture I can fit it into those UV requirements of the other image. That way I can use this tool to 'rebase' a bunch of my textures to in-game Zomboid models!
Keep up the good work!