OK I found a nice solution to keep both modes of the throttle lever. By default, the aircraft should now load with legacy mode for the first time. you can bind however the controller button to the event THROTTLE_REVERSE_THRUST_TOGGLE. pressing the button will allow you to change the throttle mode between old and new behavior. At the end of the flight simulator will remember the state of the throttle mode so you will not have to switch it over again and again. You can try the change from here:
NewoPL/msfs2020-C208-Improvment-Mod: Cessna 208B Improvment-Mod for Microsoft Flight Simumlator 2020 (github.com)
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