New KStars (version 3.6.5 ) will carry a lot of changes and improvements. One of them is the overhaul of 'Rotator Settings" (or better 'Rotator Control'). The rotational position of the camera is now called 'Camera Position Angle' in the style of the original meaning of the position angle of a star and describes the angle of the camera upright direction respective to North Celestial Pole (International Astronomical Union [IAU]). This is often called - somewhat unclear - "East of North". A more explicit definition would be "... measured relativ to the North Celestial Pole, turning positive into the direction of the Right Ascension" (Wikipedia).
With the new rotator control the user now only sets the desired camera position angle and the other angles are calculated depending of the pierside. The rotator gauge displays the actual camera position angle (yellow) and the raw rotator angle (gray). Both are represented in viewing direction. Each time a [Capture & Solve] or a [Load & Slew] in the Align module is brought into action the 'Camera Offset Angle' is recalibrated. The raw rotation angle is then calculated from the solved Camera Position Angle and the Cameras Offset Angle.
Apart from these changes in the user interface, the whole internal process was rewritten and based on a new logic. The new Rotator Control implements a throughout "flipped position angle" policy, allowing to preprocess all produced images with the same bias, dark and flat. So after a mount flip, the rotator angle and camera offset angle now remain the same: Only the point of reference for the rotator angle changes (e.g. from North to South if the mount flips from West to East). Thus the camera upright direction flips or rotates by 180° when the mount flips, as seen in the illustrations, leading to a new "flipped position angle" of the camera frame.
In this default mode a [Load & Slew] now checks the pierside information of the reference image and the actual mount pierside when the target is reached. If the two sides differ the rotator moves the camera into "flipped" state too. Please note, that this feature only works if the loaded image is in FITS format and has the pierside information.
You can always override this policy by checking "Save Camera Position Angle to Sequence Job". In this case any subsequent jobs added to the sequence queue would always rotate the camera to the saved position angle before capture begins.
If you're interested in testing, you can download INDI Nightly Build (3.6.5 beta) or compile the upstream master code yourself. Any feedback is welcome and helps fixing issues before KStars 3.6.5 stable is released. Especially experiences of users living in the south hemisphere are highly appreciated.
Remember that INDI Nightly Build is *beta* and the changes are quite extensive. So make sure you can revert to your standard (stable) version in case of issues.