I just wrote out a new version of the Maya to FBX export script, this time in Python, and with a lot of bugs and instabilities cleaned up. It auto-detects deforming vs. non-deforming objects, and exports each type of object to a separate FBX, optionally from a selection. Everything is baked into world space so there are no complications with unexpected transforms.
The new script is on the scripts page, in place of the old MEL one.
Post a comment if you have any questions…