I have the nwn's hacker guide. You can use nwn's bones. There are 154 animations available for nwn which are *MANY* more than the original battle model has.
All you do is load a generic character in gmax and replace the NWN model parts with the exported FF7 model parts. You keep the old bines but use the new model.
I have a copy of FF7PC now so tomarrow I'm going to play with GMAX a little and see what I can do with nwn models. If I'm right, all I need is the FF7 Max models and I'll do a body swap and see how NWN deals with it.
The downfall is we loose the cool FF7 poses we all like, but giving those up for 154 poses and the ability to play as cloud in NWN should make up for that.