Timeline Marker Start/End

This would be to make adjusting start/end timeline frames easier if you are working with multiple starts/ends. The idea would be to right click on a marker in the timeline and be able to make the marker frame either the start/in frame or the end/out frame. This should also be able to be done with camera markers and not just regular markers. I go back in forth between multiple starts/ends while animating I imagine others might as well, this would make it easier if you don't remember the exact frame number.