I think for all mods & versions of the game you need to use the flak gun manually if you want to target enemy surface ships.
Will it work well?
Depends. Some mods would probably have what I consider to be overpowered flak guns.
IIRC the 20mm's are not very effective against surface targets in the mod I prefer (SH4: TMO). This is historically accurate. Even 88mm and 105mm shells were underpowered for sinking merchant ships. Small flak rounds of 20mm - 40mm were even worse. Sometimes, light rounds would even ricochet off of unarmored merchant ship hulls. So if it takes a long time to sink something with the flak gun, that's how it should be.
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