Automatic yaw CW/CCW when flying manually

Hello guys,
My first suggestion - sorry if it has been suggested before. It would be very cool to be able to yaw the bird at a programmable rate CW/CCW while flying manually and be able to trigger the yaw start when required. I know I can set up a mission to do this focusing on a POI but say flying along a narrow path or river it would be great to initiate an automatic yaw when passing an object of interest. Obviously, this is quite tricky to do manually in a confined space so having it automated would be great - what do you think ?