Hi Andy,
that is why the main division airplanes have that information. Or at least, the recommended takeoff and landing flaps setting. As Conrad said, the perfect values are depends on the aircraft weight, also it is not sure that the model represents perfect real dynamics.
For takeoff I usually use 30% flaps (usually 10 degrees on most planes) and 100% for landing. After some practice, you will know or feel when you need to release the flaps.
If you reach to the MD-17 in your progress, you probably flew a lot with big heavies, so I am sure it is not new info to you, that you start extending your flaps under 200kts. On your base leg, you will probably be at around 180kts, with around flaps 10. When you catch the localizer you are around 160kts with flaps 20. When you are aligned and drop gears, you apply full flaps, and land.
I think that is not so complicated to mention at every single airplane, but as you said, it was planned to provide more information. I cannot promise though.
