If you can please contact the ATR dev Hans Hartmann to get this issue fixed that would be great. We had 2 major updates for the ATR since its release and should be expecting a 3rd update. People have noted RNAV issues with this specific aircraft on the MSFS forums so I hope it does eventually get fixed.
For regional airliners, it would be great once Majestic Software finally port their Dash 8 Q400 and Flightsim Studio finish their study level E-Jets 175. A return of the Twin Otter with improvements would be nice after it was pulled from sale.