RE: Futaba 12z - Option to use all 14 channels on receiver?
The 12FG does have the switched 13 and 14th channel available. the MPDX-1 currently does not work with it, but with the software updates, they could add it later.
Only a few differences between the Z and FG, one being lack of mixture control and no spline curves. If you look at the manuals, they are almost page for page the same.
Jeff