Feature Idea: Export snippets of video

Allow for some very simple timeline selection before exporting so we can export only a snippet of a test instead of the whole thing. This would require the ability to view the composition before exporting (which is mentioned as an issue elsewhere on GS).

The benefit would be that you take up much less hard drive space, and you can easily grab the minute or two that you want and export quickly. Right now export times are prohibitive.

On several occasions I've decided against exporting videos for a project b/c of the sheer amount of time of exporting. Thinking about the issue a bit more made me realize that I only needed to share a few moments from the test with my team members...the critical interaction points of the test. A super simple timeline and export snippet feature would help fix that, I think.