WOP has a decent FM and DM on "realistic" mode. I haven't tried "simulation" mode because it turns on the complex engine management system and etc. Although on "realistic" mode you still can overheat your engine. Tried P-51D and chasing an 109G10 for 18 mins cuz I kept pushing my aircraft hard, almost blew my engine. The only gripe with this excellent game is you can't see hit sparks everytime. I think its tied to your gun converage. They update this sim often last few patches added difficulty options on the training mode to give a example. OH. Another thing, its a bummer that you can't practice A2G in the training mode. WOP has a basic recorder, its not like in IL2 were you have lots camera options and in WOP you can't re record your changes like you can in IL2.
Squid on the demo, you can try "realistic" and "simulation" modes if you do the demo's campigan mission. You'll see an difficulty slider on the campigan screen at the bottom. IMHO, WOP is very disabled friendly. On "realistic" mode it has auto engine management (although you can overheat your engine), auto flaps imho that's big help for a disabled simmer like myself. Glad I bought this.
Falcon