Allow video tracks or clips to be visible in editing but not exportable.
For example, a grid track or other reference image could be visible while editing, but could be set to be not exportable.
This would follow conventions already set by many other 2-D and 3-D graphics programs that allow reference layers like grids, bleed marks and registration marks to be visible while editing but not printable.
Each video track could have an "export disable" button, for instance, that would allow the track to be visible in editing. Or it could be clip-based.
Antoine (Autokroma.com) commented