I am unexperienced in texturing 3d game objects, however, I think I might have an idea. Composite all the textures into one image, then use your remapping idea, and edit the uv's so only the part covered by the uv's is shown on the objects. I have seen half life textures, they are a group of textures shoved into one image. Different engines use different ways of texturing, like bf1942 uses mipmaps. I haven't really seen any 3d games where maya was used for modelling, as there are few export plugins for games. 3dsmax (curse word!) is to my knowlage usually used for most 3d games.