As I recall, this has been on the list before, but seem to have vanished at some point.
As users are contributing with sample projects I think the need for FF to open projects by "executing" a project file, becomes more and more interesting for people whom may try out such projects from the desktop and other not so common project locations, making it more efficient and convenient to work from the file to FF rather than FF to file.
My way of supercharging work efficiency while swapping several design projects for customers during the day, are mainly based on this more effective route of executing and opening documents ...