For now I?ve solved the problem in another way. I?ve set the inner template as default, assigned the Imagefader only with homepage on the "user1" position and unassigned all modules from homepage. So the look is nearly the same, but with white background instead of black. For me this could be a solution, but for other people it would be interesting, how to solve the conflict. Cause its an shop template, so it should be suitable for shops.
But anyway, thanks for this brilliant support!