Along with #2 that you mentioned, maybe subs that can dive. The standard response to sighting a plane was to crash dive - only when the sub was stuck on the surface for various reasons including reloading externally mounted torpedoes, or fueling next to a "milk-cow" was AAA used. There were specially built flak-boats which conning towers with multiple quad AA installations, to project other u-boats, but these were very unsuccessful.
But yeah, +1 on the pre-built ship convoys and simple ship AI that takes evasive action (to an extent - sometimes ships had to stay in line no matter what). This would make situations like the battle of the Bismark Sea possible in which Beaufighters struck convoys with rockets, destroying flak and bridges. Anticipating a torpedo attack, all the ships turned 90 degrees to face the Beaufighters to reduce the area that could be hit. But by doing so, they exposed themselves to attacks from B-25s which were carrying bombs.
This is impossible to replicate in Il-2 because the ships have no AI (you would need to time the way points perfectly) and because it's impossible to inflict damage specifically to guns, bridges, etc.
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