The Lyran, Hydra, Gorns could work as other factions as seen in the old starfleet command (1), not sure the dev team would want to add these relatively unkown factions in though.
The Hydrans were always the coolest to me and would make a very cool addition to star trek armada 3, they prioritized fighters, had 2 unique weapons (Fusion Beams and Hellbore Cannons) and sported the color blue and purple on their ships, which looked cool.
dreadnought101
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