yeahhhhhh.... not the best of help.

as you know, target a ship by right clicking on them when the bombers are at max altitude. when the bombers reach near the target, start rapidly clicking ("spamming") just before the planes' shadow goes over the ship. this will make it so the bombers will release as soon as possible, for maximum accuracy and minimum plane loss.
have fun.

so... spam right click

rapidly clicking what? LOL Even less help

simply double clicking once will do the trick as well, altough you need some ability on your bomber pilots (& no lag) to be sure of a max altitude drop.

Bomber ability on DB and TB pilots is for aaw resistance and combat (aircraft v aircraft) only. All skill is in your hands and to an extent the aircraft AI.

Also, t he reason people will say "spam right click" isnt because you need to click a ship 20 times for your bombers to drop. The higher your planes are when they drop their bombs the more damage they do. Spam clicking on your target when your bombers are close ensures they will drop their bombs as soon as they can.