Contrary to the silly arguments that belly landings are completely safe, you have a great idea. I might even decide to post 20 you tube videos showing the real dangers of belly landings..... Nah, it doesnt take a genius to know that belly landing a combat aircraft is a huge gamble.
Did anyone check the fuel gauges of the planes in those videos? Did the combat aircraft in those films have any ords left, or rounds in the guns? Did they have battle damage that that compromised the strength of the aircraft in a critical spot or a golden BB strike that waits until the crews hopes are at the highest point thinking they are going to live until an explosion takes them at the last moment.
These things happened thousands of times during the war. They were not safe and rarely had the picture perfect conditions of a youtube video.
Your idea is well thought out. I like the idea of increasing probability of fire with more damage especially with fuel leak.
And as Grizz pointed out, we have no incentive whatsoever to fear for our lives or that of the aircraft which is extremely gamey. There is "a fine line between fun and war" and different games draw that line at different levels. I'd prefer a game thats harder and more realistic than 'Blazing Angels'