Scene Selection Indicator
The current method of marking a Selected scene's thumbnail is a thin, white-or-gray vertical bar.
This can be very hard to see, especially if the thumbnail is very narrow (as for a scene of short duration).
I have made jpgs that illustrate this problem and my proposed solution, but I don't see how to upload them to you.
My suggested solution is to enclose the selected scene's thumbnail with a 2-pixel black border.