Probably the best solution is not to offer shaderless visuals. Just implement different shaders/ effects without normal maps and the like then. (Btw. in my understanding there really isn't a fixed function pipeline anymore for a long time (on a hardware basis), it's just shader based all the time.)
"Falls das Resultat nicht einfach nur dermassen gut aussieht, sollten Sie nochmal von vorn anfangen..." - Manual
