So, I've seen the topic discussed a lot on the forum, and a few thoughts have occured to me.
Please, keep in mind, I'm an advent player, not vasari, and that this is simply a suggestion. Please feel free to add your own thoughts. However, please refrain from letting this thread become a shouting match.
First, a lot of people have been complaining about the fact that the Vasari did not get an anti-structure cruiser. The general retort for this was that their SB is their anti structure cruiser. However, following this chain of logic, it seems then that they are without a true starbase. If you say that their SB is their starbase, then we're back to the original problem.
I submit, therefore, that it would not be out of character for the vasari, given their aknowledged technical superiority over the other races, to have developed two distinct SB designs. One being designated for assault duties, the other for point defense. They could both be built from the SB constructor, with perhaps different techs needed to access them.
The assault SB would be less expensive, but also less powerful than the point defense SB, as it would need space for engines and other such items necessary for an attack craft. It would be better than the other races anti-structure cruisers, to offset the facts that it must be built from a constructor, there would only be one of it in a gravity well, and it is unable to phase jump. It would also forgo the upgrades available to the point defense SB, as really, by the time they kicked in, the battle would probably be over. Instead, it might have techs you could research to make it permanetly better, like a normal ship
The point defense SB would be more powerful and cost more than the assault variety, and would function much like the starbases of the other races.
These were my thoughts. Or perhaps an extension of someone else's thoughts. I think I may have seen this idea floating around before.
As to getting the assault SB places to assault stuff... That's for someone else to puzzle upon. Perhaps something to do with the vasari superweapon...