Repair party & engine boost
A warship already had a damage-control party to put out fires and stop flooding. Now it has two more consumables to manage: a repair party that heals the hull back, and an engine boost for a burst of flank speed. Both are on their own cooldown, so the fight is as much about when you spend them as anything else.
Repair party (T)
Press T and the repair party goes to work, regenerating a slice of the hull's health every second for a few seconds. It can out-heal a fire, so you've got a real choice: pop it now to claw back the damage from that last salvo, or hold it — because the moment it's on cooldown, a fresh fire or a citadel hit has nothing to answer it. A green sparkle plays over any ship that's repairing, yours or a visible enemy's, so “they're healing — push them now” is a read you can act on.
Engine boost (G)
Press G for all-ahead-flank: a temporary lift to the hull's top speed. It's the answer to a dozen situations — close the gap to get your guns on target, kite a slower battleship, swing wide around an island, or comb a torpedo spread that would otherwise catch you flat-footed. A battleship boosting is still no destroyer, but the extra knots are often the difference between eating the fish and slipping past them.
The enemy plays them too
Both tools are in every captain's hands, yours and the bots' alike. A wounded enemy will pop its repair party to claw back health mid-brawl, or light the boost to break off and run when it's badly hurt — so the green repair sparkle over an enemy hull is your cue to close and finish it before it heals, and a ship suddenly pulling away is one you may not catch.
Five things to juggle now — shells, smoke, repair, boost, and the damage-control party — and never quite enough cooldown to go around. That's the game.