Currently we can assign one governor per colony.
Which means I end up with a very large number of unassigned civilian admins who don't do anything at all for their entire careers.
Why not allow us to assign more governors?
For any bonus type, the colony could simply use the max bonus from the assigned governors.
Perhaps an installation is required for each governor slot after the first.
I'm thinking it should be big and expensive, to make it a non-trivial decision. Maybe akin to a Sector Command.
Maybe it also requires workers, so that you can't just flood every new colony with a governor for every bonus.
The first thing that comes to my mind is "design by committee".
Maybe you have to build a slot for each bonus (think science department, CIC and so on) and each governor who has that bonus but is assigned to another slot has a chance to reduce the bonus of the governor that actually is assigned to that slot - meddling in the other guy's department, making them look bad to look better themselves.
If there is no slot for a particular bonus, the governor who has that bonus at the highest level is applied at a reduced value and the others may sabotage them as before.
In the next step you would want methods to specialize your governors - fewer bonus values to prevent them from messing up their colleagues' work.
Of course when it comes to getting new colonies on their feet you might need those generalists again.
Or you introduce political parties, where it becomes less likely, that governors from the same party would sabotage each other (still happens - just look at the news - but less often).
This could also happen in reverse, when two governors really like each other and are working together to look better by doing better jobs (outlandish concept, but here you have it).
Shutting up now.