All bombs in enlisted drop in pairs if possible regardless of it actually making sense or not.
If they start changing that then most planes would doube in their effective payload which would make living hell for everyone else.
Some fighters even could drop a single bomb 50kg mounted on their wings and just countersteer the effect of the unbalanced load if my memory serves me right.
They should actually give the separate bomb drop ability to more shitty attackers like Potez / Blenheim to make them more interesting and relevant as an attacker choice.
Light, twin engine bombers that are otherwise shit and lack any serious forward firing equipment.