Fly with that ability to use GPS/ATTI/Failsafe AND Manual all at the same time.
Using two p-Mixes, here's a way to have your main switch set to GPS/ATTI/Failsafe yet still be able to assign Manual mode to a spring loaded switch.
Works great if you want to try out Manual mode and instantly switch back to GPS or ATTI mode at the release of the switch.
While still allowing you to enter Failsafe mode without having to turn off the Transmitter.
I did with with the Futaba T8J, but it should similarly work with other Futaba Tx models as well.