With regards to the Rewired Throttle you can treat it differently in the HOTAS based on this throttle calibration. You can use +1 to 0 (which is what @Steve-Tack ) likes or your can treat it as +1 to -1 (which I like). In my case then you can treat the middle as zero and have -1 for reverse thrust. But the option is yours on how you want to treat the Throttle.
For information here:
The Rewired 1.1.11.0 release notes for that particular change for throttle calibration.
- Added Throttle Calibration Mode option to switch default throttle calibration between 0-1 output range and -1 to +1 output
Rewired - Advanced Input for Unity page-78#post-3442229