Sometimes I take star pictures with a ball head tripod and a DSLR camera. Some of those times I want to use kstars to see what objects are within. But kstars has only two 'browsing' modes: horizontal and equatorial. Both only allow movement along lines on a sphere, but not rotation. The ball head provides an extra axe which I can't reproduce in kstars, so I can't really align with the photo. I'm not even asking about adding a rectangle that simulates the sensor + lens setup, just be able to rotate the image around the axis that would go through the center of the image. Of course, a first implementation could start with just a couple of shortcuts, maybe a couple of buttons, and a later implementation could include mouse control. OTOH, I just noticed my version is somewhat old, so I don't know if this has been implemented. I would guess not, since I can't find another wish for this.
there is "Simulate Eyepiee View" in the context menu where you can free rotate and flip the view, this doesn't satisfy your requirements?
Yes, kind of like that, but for the main view. Either that, or a way to add more eyepieces, extra points if it can be expressed in terms of sensor + lens.
Sky map rotation should be available in 3.6.5