I posted this on the official forum, but they are down at the moment, so I will post it here as well. I'm pretty sure that this should work. I know that there is a way that a script can request the total thrust of the user's aircraft, because otherwise the HUD in the DKM Bronco would not be able to display the total engine power. So I'm pretty sure that this will work. The idea is that the script would request the total power of the aircraft, and once your power exceeds say 98%, then the after-burner would activate automatically. Once your power goes below 98%, the after-burner would shut off automatically. This would be much easier than hunting through the action menu when you are in a dog fight.
Another idea that I had several months ago, but no one seemed to notice, you could write a script that would spawn a static object "above ground" crater wherever a bomb impacts the ground. The crater wouldn't have to be anything fancy, and it would not indent into the ground (this isn't possible in OFP anyway), it would simply be a pile of dirt in a ring shape made into a static object (the same way that the GFX bunker pack trench was made). This way if you drop a bomb on a runway, one of these craters would appear, and no one would be able to use the runway without crashing their aircraft into the crater (essentially disabling the runway).