Visual editor tool for missions

So I've setup a somewhat serious bridge (DMX lights, web server, props...etc) and play with friends on a semi-regular basis; The overall feelings have been very, very positive; Everyone seems to have something to do (including Relay, with the new hacking mini-game), and is engaged throughout the experience.

The biggest issue I'm dealing with right now as a GM is actually the lack of content; I see this as one of the biggest areas of improvement that would bring more interest to the game for a large number of people who might want to contribute but is put off by the programming aspects required.

What are people's thoughts on the development of a visual editor for scenarios? What kind of challenges are there? Would it be useful? What would be the best way to implement it?

No files, tests, or entry points are mentioned. Start by surveying how missions and scenarios are currently authored in the Lua-based project, then define the visual editor's scope, implementation approach, and acceptance criteria before considering a contribution.