So, I'd like to thank everyone's comments so far. I'm working on a somewhat major revision to my current idea so far, stealing several ideas from Duelle and a couple ideas from Kitru in the process, because you two have really good ideas on this stuff.
For those of you who don't want Corsair to be a "Gambler with a Token Gun", I'd like to remind you that, like with a Bard and its songs, you don't necessarily need to use the dice. They're there for support, and otherwise, you've got all your stuff from Musketeer to toss around. Otherwise, I'm keeping the 'gambling' mechanic. I'm sorry if you're disappointed in me on that, but as I said at the very start of this topic, nothing here is official. I don't work for SE, nor am I some sort of "Contractor" or something for designing new classes and jobs for them. I'm just a regular player, posting what I'd love to see. And that includes Corsairs tossing dice to help their allies.
That said, if you have your own ideas on how you think Musketeer should be built, what kind of jobs it should get, and what weapons and armor it would use, by all means, post them. You can post them here, you can make your own topic, or you can post them in someone else's topic if it's related to the subject. I honestly would love to see what everyone believes SE should do with Musketeer if/when it releases the class. :3