To answer your first question = practice and experiment. Open a MAT pose file in a text editor and look at what it contains. The easiest way is to set your textures for a character and save the file to the library. Then open it in a text editor and transfer the data from the cr2 to the MAT pose file, overwriting what is there. Later when you get it, you will be able to do the whole thing in a text editor without the cr2. A principle to remember: if you do not want to change it leave it out of the MAT pose. Put another way, only include those lines that you are changing. For example, if you are not apply a bump map, do not include the line that has "NO MAP" for the bump. If you do, then if you have a character with a bump map and you use the MAT pose to change a texture, it will erase the bump assignment. "If it ain't broke, don't fix it."