Got myself a cup of tea and got myself calmed down.
Thanks for the quick reply.
I loaded your scenario up and the CRJ did indeed respond, as expected so it definitely seems to be a problem on how my sim starts up. I guess it's time to take back all the mean things I said 😅
It gets more interesting though. I was able to find the cause for the problems.
So after about an hour of testing and loading and closing FSX down over a dozen times with different variations (FSX native standard flight / your situation defined as the standard flight) I was able to figure out that the positioning of the Aircraft was off by .1 on the POS INT page. I was also able to figure out that this only happens, when the parking brake is not automatically triggered on loading in to the sim. The difference between those two "standard flight situations" is, that with the trike the parking brake is not triggered automatically while it is on the Cessna. FSX seems to load up the start up procedure of the default aircraft regardless of if it's ever been loaded up into the sim.
I guess it sounds a bit confusing (since I am terrible at explaining) so I'll quickly record a video and show my findings off.
But basically my guess is that the CRJ is having issues dealing with that very first load up, because the aircraft was still moving while initializing the systems.
So the work around for this is to use the Cessna as the default aircraft in the User interface. It doesn't even have to be used for the first load in to the sim.
I'll post the video as soon as possible to clarify what I am trying to say.