I experienced the problem, but only for a very short period of time. I quickly and permanently adopted this solution. I never separate the video and slide timelines. Anytime it is necessary to play a video, it is on a separate slide (even if thge new slide looks exactly like to previous one.)
The video starts with the slide, and the learner is not permitted to stop or pause the video. If necessary, they may stop or pause the slide. Stopping, pausing, or restarting the slide causes the same action in the video.Selected, else resume.
You are right, depending on the source of the video, it may be necessary to put a box over the video to prevent clicking it from stopping it. I personally am uninspired to provide more alternate means of controlling the video.
As to your double click problem, use the state of the box. When the video is paused by clicking on the box, it is changed to Selected state. Create a trigger to change it to Selected if some other means of stopping the video is used. Change the triggers on the box to pause if state is Selected, else resume.
