Hi, on YouTube I found a tutorial made by Ralf9636 how to configure your control settings in the flight_model.cfg file of your aircraft. Very helpfull and what I use since my installation of MSFS2020. As we speak I still have the rudder effectiveness set to 0.0 and this works fine with me. Herewith the link to Ralf's tutorial:
Good luck and happy flying!
(Note: with every major update you have to check on the referred cfg file as it may have been overwritten)