Many planes in WWII, when faced with landing damaged, chose to land on the grass alongside the runways.
If they did they were making a mistake unless they just wanted to keep the runway clear, don't land wheels up on grass your more likely to dig in stop short and die.
When I first started this game I would land and then pull off the runway, could not understand why I kept getting the You have Ditched message.
I know its a game and has to have compromises but I think it would be nice if: when you landed with your gear intact that would count as landing, when you break it off its a ditch, if you land it in your territory its better then landing in their territory, if you land at your field its best. I'm sure somebody out there knows but I'm pretty sure most wwII AC could operate from grass. I was under the impression (from movies I'll admit) that during the BOB spits and hurricanes operated from grass fields. I don't know if it holds true for warbirds but little taildraggers like grass better then concrete which irritates and makes them want to ground loop.
I also wish that when I lowered my landing gear to surrender they wouldn't just shoot me down. Inhumane sonsabishes.