In order to allow the Vasari Rebel Starbases at a sun to work (at a 4 cap limit as it is with other races,) I've found that you need to change the buff file "BuffPhaseStarbaseSameOrbitbodyDebuffRecourse".

by changing 

numEntityBoolModifiers 3

to

numEntityBoolModifiers 0

and deleting the values

entityBoolModifier "DisableAbilities"
entityBoolModifier "DisableFighterLaunch"
entityBoolModifier "DisableWeapons"

the starbases were made to be operational (so long as they were built within the stars gravity well; you'll still be unable to warp a starbase in so-long as one remains in the suns well... which is less than ideal but a good start.)

NOTE: I'm using 1.03, these changes may have been already made/implemented in a more professional manner.