To implement the custom texture editing NOT required access to the operating type system of AChat. You can use this method:
designers buy at the shop pack standart textures, and download it from site. After editing, will copy your own textures in special subfolder in folder with game. Games at startup, custom textures will be loaded from this subfolder. Publication design textures can be done in a special section of the site with moderation AChat Team.
This scheme works fine in other games… I think that's very interesting to implement this in Achat.