Quote: "If you read my post I said it IS possible, but not with FPSC as it comes when you install it Unless you want a really hacky/crappy system that is."
I think that depends on the user more than the engine.
Yes , it has limitations but vehicles and flight is possible with stock.
You would get better results though with a modded version, which means knowing how to code in DarkBasic Professional (DBP or DBPro).
Your best bet for custom simulators would be to get the
Dark Game Studio Bonanza.
I would still get FPSC too, and play with that also. (for that you want the
FPS Creator Bonanza)
It is great for lots of non-coding stuff, and then once you learn DBP you can modify it to do pretty much whatever you want depending on your efforts.
If you take advantage of those Bonanza offers now (limited time and really great deal) then you will have a game making arsenal for cheap.