I do realize that most of this may not really apply to really complex FG aircraft/spacecraft, but I've found the fgtape (flight recorder/instant replay) feature to work remarkably well to reproduce certain situations/sceners, often in conjunction with the route manager flying a pre-defined route in the form of custom/offset waypoints. I suppose if we could gather more feedback like this (tools, best practices etc), that this could help provide a better experience for all parties involved, including those actually promoting fgfs by creating such videos.
Besides, it may not even be that far-fetched to provide some kind of "integrated" UI to gather useful features (and properties/widgets to control them) in a single UI dialog (be that, PUI, Phi, Canvas or whatever else) - for instance, a tabbed dialog could be used to emulate a simple "wizard" interface that could allow people to set up relevant portions of the flight - with widgets included to control existing features like the route manager, autopilot - but also the flight recorder subsystem - probably in conjunction with certain view/rendering settings, and fgcamera in particular.
As you know, the corresopnding PUI/XML dialogs are rather losely coupled, i.e. it would not that difficult to take useful features from existing dialogs (rendering, weather, view, route manager) and come up with a new dialog that is specifically designed for people creating videos.
I did once create such a mashup interface to more easily test Canvas related features, i.e. to access useful features in a more direct fashion, without necessarily having to click through dozens of options.
Just some food for thought obviously ...