There are some good ideas there, though they have been proposed before and met with heavy criticism.
I agree with all with the following exceptions:
Level bombers should not be penalized for dying within 20 seconds of the bomb drop. The reason being that you've already implimented a method to prevent Suicide Level Bombers, why add a second penalty if they are legitimatley (Nice spelling, huh?) Shot down?
I know from my experience, the smart interceptors wait until a bomber is in Bombsight before they attack. Therefore, you're penalizing the level bombers when they are most vulnerable to destruction. If you are going with the "Bomb only on autopillot method", the secondary measures is not necessary. Even if implimented, though, it would'nt bother me much. I've got more bomber perks than I can possibly use anyway.