With some goodwill and many time it would be really possible to do a module
where you must travel and you can gain cash and money and eventually
get new add-ons.
As I see it the module would create scenary file that give access to new
add-ons as you progress with your gain.
You would be able to load somes payloads and gain cash from briging
them at some defined place.
A lot of things can still be done in Orbiter, what is lacking is time
to do them.
Dan