Hi, Thanks for reaching out!
Good question. The main limitations with the character Creators is it's size, since it's fully spritesheet based and there are alot of different gear piece's, each made for all available animations, it quickly becomes thousands of spritesheets. Even compressed they take up alot of size on disk, so I have to be selective when it comes to what animations to add. I'm trying to compensate by releasing packs that are not possible to otherwise create in the Character Creators. I have no plans to add zombie animations to the Creators at this time.
Regarding commissioned work, unfortunately not due to time constraints.