When holding down the button to rotate the mouse with the camera, the mouse input still moves the cursor as well. As you rotate further, the cursor eventually hits the edge of the screen, preventing you from rotating further.
You have to let go of the camera button, return the cursor to the center of the screen, and then hold it down again to continue rotating, which is rather annoying. I have tried doing this with multiple hotkeys and the behavior remains the same.
I'm assuming this is unintended behavor and will be fixed at some point. This would be a HUGE quality of life improvement for me, personally!
Loving the game though! Thanks y'all!