[I made a toggleable thrust reversers workaround plugin for Joystick Gremlin, for my TM Warthog!]

@SimWare
Here we are, a year later, still having to use this. Come on guys, we know it's possible to use the "Hold throttle reverse thrust" because other thrid-party devs have done this. On top of that, you implemented a custom controller for the throttle, which reads device inputs... seriously. If I can translate my device inputs in a simple python script (I'm not even a python dev) in an afternoon, so can a high-end, study-level aircraft dev over a year.

[I made a toggleable thrust reversers workaround plugin for Joystick Gremlin, for my TM Warthog!]

SO! Missing my toggled thrust reversers I took it upon myself to write a plugin for Joystick gremlin.

Just add it to your plugins, select the physical axis and button on the right, as well as the vJoy axis.
Add a second instance of the plugin for the other engine, set the axes there as well...

 

Then, in MSFS bind your vJoy device axes to Engine 1 and 2 throttle, like you would normally, and finally in the CRJ, turn on the hardware reverser axis and set your positions.
 

In essence, what this script does, is take your throttle inputs, which go from -1 to +1, and split them into two ranges, -1 to 0 and 0 to +1.
Normally, the warthog sits at -1 in idle, which now becomes 0. Full forward throttle (+1) is still MAX POWER, but full forward throttle with the joystick key pressed down now becomes -1, or full reversers.
I'm sure this can be done in the CRJ's code itself, since its just some simple arithmetic, switched by a joystick key input, but until then - hope this helps!   

CRJReverser.py