1600 posts > 20 posts.
Anyways... It is not impossible to do a 7 speed manual if you start from scratch. They can't use the SMG box, because it wasn't designed to be one. I doubt Getrag and Sachs even would want to make a 7-spd manual. ZF could do it, and are probably doing it for BMW.
2006 Corvette Z06 Red/black
2006 BMW M5 Sepang/Sepang SMG III
2006 BMW M6 White/Black 6-speed