Actually those were some kind of precursor to the viper that was only capable of atmospheric flight. I can't remember what the name of the plane was, but I've got it somewhere. Still, it's not a Viper as that model started with the Mk I that looks like the TOS Viper. There were a lot of planes and ships that used the Viper style body but weren't classified as Viper models.
And if you look at the way Vipers fly in atmosphere, I suspect they would use some fly by wire system as the stabs on all the vipers are so short and unstable. It still at least seems possible for them to fly, they would simply need to constantly constantly have power to the main thrusters like any other plane, and possibly make constant use of the forward RCS thrusters for nose lift and banking. It is noted that vipers do use more fuel in atmospheric flight than in space.
Also, vipers are much smaller than starfuries, meaning they're not only harder targets for those without highly advanced targeting computers, but it means a lot more of them can fit in a battlestar. A vipers critical systems are all in the main body itself as well, so a whole control surface can be taken off in the vacuum with out a catastrophic failure occurring. As far as what a starfury can do, I have yet to see, so I'll have to watch B5 before I can talk about it.
Still, whether they're vipers or starfuries, they still have the same flight dynamics. So, I think there should be another option opened up.