There is already possible to get that effect in the TCE now. This is what I do. Open the textures in a paint program and combine all the textures you need to one picture. Load the texture on to the object, and open the TCE. Select all surfaces and resize them to nothing. (this in case you dont want texture on any other surfaces.) Select the surface you want that special texture applied to and click the front button in the remap section in the TCE. Now resize the surface in the TCE to fitt the part on the texture. In this case red and a printboard.
This can be done in several ways to get different textures onto the model. The clue is to have all the textures you need in one picture, and just move the surfaces in the TCE
