Interested in the answer to this, too as even a decent wheels up forced landing seems to end in the A/C blowing up. There seem to be to be variations in the animation that kicks in, there being several 'crashed' files in the animations folder, but the only results supported seem to be bailed, ditched, crashed and landed - no force landed (if the filenames are anything to go by). Although the briefing text file suggests a wider range of outcomes is supported, including 'PlayerCrashLanded' as well as 'PlayerCrashed'.
The mission result shows no sign of tracking the loss of the player's A/C so I wonder if it would be possible to rename one or more of the 'landed' animations to replace one or more of the 'crashed' ones. But if the sim doesn't distinguish between a serious crash and a forced landing, that mighn't be very realistic as a representation of what 'really' happened. on the other hand getting a 'walk, run or limp away from an explosion' at random half the time, and whatever you see when you 'just land' the rest of the time, might be better than getting the former all the time.