Manual throttle modes in Plus Version

Hi,

So I've got virpil collective with throttle and have mapped throttle 1 to that and assigned throttle 2 to a rotary dial. They're both calibrated and I've marked the neutral position in with a marker on both controls.
However, when I move the throttle out of the neutral position,  It'll say "Twist grip degrade", but it does not switch into manual mode, as it's supposed to. Only reaction I get is when I move the throttle all the way to idle and then it just shuts off the engine.
 Now, if I use the Eng Manual switch on the overhead panel, it does switch into manual and the throttle works as intended, so my workaround was going to be to map that to a switch, but the Eng Manual  do not appear to be mappable?
Do I need the pro version to access that?

Also, when I use the Eng Manual Switch, it closes to my Garmin 750 window?.

Only output in the log is this:

"[EC135] Manual engine control engaged for engine 0 at 0.317372"