OK, the second seat I can accept. A rear-gun... fine, thought I'm not happy with it. But a fighter repairing other craft? That just doesn't work for me. There isn't any need for it either, what with Gallofrees and Bulk Freighters handling repairs. I've never heard of an FPS game in the entire history of Battlefield where you could form up with another fighter or helicopter and be repaired by it, and I don't really see a reason why FS should be the first.
"Another Rebel craft like the Gunboat" would of course be the Y-Wing. It has a rear-firing gun, roughly (read: pretty much exactly) the same argument, and the same role (read: all-round attack fighter).
I'd go with my favorite the Skipray Blastboat as a heavy support "fighter". It fulfills all your requirements (gun turret, slower, heavily armed, and so on. I'd actually be sort of happy with it doubling as a repair craft, too, since it's a big ship, more like a shuttle than a fighter - you could very conceivably say that there are zero-g technicians spacewalking out of it with tools and whatever to repair fighters, kinda like we Earthlings do with our space shuttles. So yes, I'd be happy with having a Blastboat repair fighters near it, although for balance we should probably restrict it somehow (have the repair function only work when the Skipray is near-stationary, have it be a limited action like the Gallofrees' shields, something like that).
Having said that, I wouldn't be opposed to seeing Gunboats in the mod. We could balance them so that they're counterparts of Y-Wings. They're nice craft and among my favorite X-Wing series craft.
EDIT: As for Rebel counterpart, I agree, make it a small YT-something craft. Doesn't have to be canon, just make something up. Give it a sort of familiar design and some gun stations and let it repair craft.
Why? Why spice that map up?
Many people feel that space maps in general, and especially Taloraan, are much too shallow and straightforward, and could use more depth. Various ideas have been thrown around by the test team, devs, and of course fans, and I hope some or most of them will eventually be implemented.
PS: Canadiens, I checked out your blog and really liked it. PicLens is a masterpiece of a program
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"One of the bitches actually gave birth while she was attacking, and her puppies joined in on the carnage."
--the awesomeness that is Boatmurdered.