With audio/video timelines so condensed at the bottom of the screen, it is very common for clicks to be off by a pixel or two. When scenes are accidentally clicked in this way they move to the start of the project timeline. The extra effort this takes to fix is needlessly frustrating. I would suggest an option to "Lock the timeline" which would keep the sequence of scenes/audio samples in their fixed order. Perhaps even a check-box on each element timeline.