Hi TIPAH,
Yes, every function in this aircraft can be toggled by our (custom) commands. These commands are published to the X-Plane Command interface and can be toggled by keystrokes, buttons, etc. If you have any question about a specific command, I am more than happy to help.
The gauges do use custom datarefs (all are published to dataref-editor for viewing), but the values are based on the native X-Plane engine datarefs, so both will display similar values.
Regarding FPS, the plane performs quite well on my system, on par or better on FPS to other high-quality payware aircraft.