[RAF_Sharkzz]

very easy bro.
in you controls you will scroll down and see where you have power setting choice from 1 to 10 etc

make a key available for your power 10 setting. this will allow you to toggle your bombay doors.
not ALL bombers have BBD's avalable though, but there are plenty there.
remember of cause, to OPEN your doors when making a drop or you will miss your target LOL
hope this helped
~S~
Sharkzz