Autopilot behavior has been adjusted. This should resolve the aggressive turn rate. We have also added bank limit so that should help as well.
As far as the behavior when switching from NAV2 to NAV1 and vice-versa, I believe the autopilot fixes should take care of this. Although, please note, X-Plane stores heading and course values as floats. That means that the course for NAV1 and NAV2 will most likely not be the same (by a maximum of 0.99 degrees, more likely 0.5 or less), therefore there will be some change when switching between the two radio sources.
The HDG Slave and Heading Dial sync has been fixed.
The CRS1 dial and VOR dial sync issue has been fixed as well.
Update to be released soon®.