RE: 9303 Sailplane Setup
To have that it would require 2 different conditions for the same mix, which isn't possible. This is the same for all mixes. It would be on all the time in a flight mode or on a switch.
BTF is the butterfly switch, which on the air system is the gear switch, the long flat switch on the top left. Rud is the rudder dual rate switch. AX4 is the mix switch, the long flat switch on the top right.