This is will be the final version, more or less
Federer's forehand "regular" version
http://www.youtube.com/watch?v=PWL8r8aEOto
I didin't make the neutral stance...I tried it but it didn't look well enough in certain situations. Besides that, I noticed that it's better that both the "regular" and "acceleration" shots have the same preparation, at least for the feets and body rotation (like I did with Fed's Backhand and Nalbandian's forehand ). Why ? it's not a human player problem but offline, I noticed that the CPU often changes the power of the stroke instantly. It happens that he begins the preparation with the "regular" strike animation but in the end he hits an acceleration shot...if the animations are not similar, it will look weird.
Anyhow, I gave more top-spin to the stroke as you can see (not so much though)
I'll try also an "acceleration" version...if it will feel great, I'll release it otherwise I'll keep M4n4c0r's version (they work pretty well together)