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Pirate Doom doesn't use jumping or crouching, leaving you a free finger to alt fire with every weapon. Here's the list:
Spoiler:
1. Cutlass: swings cutlass / dash move
2. Flintlock: shoots / swings cutlass
2. Dual flintlocks: shoots alternately / shoots both at the same time
3. Shotgun: shoots / shotgun butt
3. Sawed off shotgun: shoots / swings cutlass
4. Gatling gun: spins up a little and shoots / spins up more and shoots faster
5. Cannon: shoots cannonball / shoots copper ball
(copper ball is bigger, slower, inflicts more damage, rips through small enemies and reflects projectiles)
6. Minicannon: shoots / shoots 6 rounds at once
7. Dynamite: throws / throws farther