IMHO, the missions should have a realistic structure.

For example:

1. New pilots who are not familiar with the FS series should start [as an option] with a campaign structure that requires them to first learn how to fly and fly to earn hours towards earning their private pilots liscense, instrument rating, or commercial rating. After achieving their desired rating, the pilots can then advance to the next avialable campaign structure that has them flying for the airlines or carriers [AA, TWA, UPS, etc.].

2. Experienced FS fans should also have the option of starting off with an advanced rating so that they don't have to go through all the basic stuff that they already know.

3. Also the FS pilots [like the Bush flyers and sightseers] should also be given the option of putting in their free-flight hours into their ratings as well instead of having to go through the missions repeatedly to earn those hours needed for a specific rating.

I like the idea of putting in visual models of people boarding the plane in the sim, but you have to remember that our current computers may not be able to handle such visual details due to the processing requirements. I feel that it's better to just render certain types of people in the sim such as pilots and copilots as well as ground crew. Nothing more. Are you sure your computer can handle over 300 visual models or 2-D images of people at the same time?

Orbiter may have reach that level but that is because it doesn't have to render detailed mountains and such on plane old spheres known as planets and it doesn't have to deal with AI spacecraft that take off from earth and land on mars on their own [yet].