So Eric said he’d need to think up Secondary effects for more than just the Harpoon if I wanted to get the Harpoon the way I wanted it. So, here’s my suggestion for Secondary Fire effects for the guns. Any with Zoom are ones I have no ideas for. Feel free to make suggestions. I WILL be emailing this thread to Muse, so hopefully we'll get a good dialog going with them too.
Artemis: normal missile breaks up into mini-missiles that spiral out in a spreading pattern, each dealing 1/4th damage. Can be used at any point after firing a normal shot.
Light Flak: Dual-Shot, firing 2 shots at once, but with twice the delay between shots.
Gatling: Zoom
Flamethrower: Zoom
Carronade: Zoom
Harpoon: Primary changed to attach rope, secondary to pull while held
Flare: Zoom
Mercury: Zoom (this is actually one I think should STAY zoom)
Mortar: Zoom
Banshee: Fire all rockets at once from all tubes (or all remaining rockets). Rockets spread out.
Mine Launcher: Primary fires mines, secondary deploys them. Minimum time before they can be deployed remains. Perhaps longer delay increases damage?
Hades: Zoom
Heavy Flak: Zoom
Hwacha: slower, but less spread, and not auto-fire (kind of just a random idea, so I'm well open to a better idea)
Heavy Carronade: Zoom
Lumberjack: Zoom