Ok...idk if this is a bug or what it is but here we go.
When you are in the B25C with the Strafer version with no bombsight, you are still able to use the bombsight. All you do is calibrate the bombsite like normal then go back into the bombsight and its there. This was shown to me and i thought it to be a little gamey so...
Also, if you are on the ground and have one engine started already, then start your #2, the exhaust smoke shows on both engines again