Database changes are allowed and are crucial part of already existing mods.
However .. changing playable units is more difficult. Some things, for example loadout are hard-coded in the game. While you can change speed of torpedo your ship will shoot, you can't change what torpedoes it will use.
What is not allowed is modification of the binaries, however many went over that border already, mostly for adding new playable platforms. Anyway for me the main problem lies in many small bugs which the games suffer and that would be hard to fix.
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