FAQ » Align TRex 550L Dominator Model with Beast X

I have an Align TRex 550L Dominator Model with Beast X. My transmitter is Spektrum DX7 DSMX Telemetry. I have been using Real Flight Simulator to practice for a year or more but I am still not getting much better when I go out to fly. So I mostly fly my smaller helis since I don't want to crash my 550.
Align Shop recommended that I use the Next Simulator. I have installed this Next using RX2sim. So far much better simulation of flying conditions and the exact TRex 550 model is on the simulator. However, other than operation of the two sticks and controls none of the the other functions are defined for my Spektrum DX7 transmitter. (hold switch, flight mode switch for normal, stunt 1 and stunt 2). The transmitter has a memory card so I can save and import settings for my Align TRex 550. It would be great if there was some explanation of how to set up a Next Align 550 Model to match the setting in a Spektrum DX7 transmitter. Thanks for any help or suggestions.