So I'm almost undoubtedly sure that the answer to this question is going ot be no, but:
Is it possible to affect the maximum alleigance of a planet by any method other than proximity to your home planet? I would really like a way to set up like regional governerships or something, I feel like vanilla sins punishes you for trying to colonize other star systems... 35% resource/tax income is a pretty ridiculous penalty if you ask me. Makes it almost completely pointless to habitate any system that is not your own.