Probably more of a feature than a bug, but....
I have a colony on Venus (colony cost 40). I originally put it there because I wanted the civies to colonize it - the Quixotic plan was to transfer a few terraforming installations onto it and slowly (over the course of 1000 years or so) bring the atmospheric pressure down to something livable. The reason for going there is that Venus has the only significant stockpile of Sorium in the system, so I could also have the population work the mines, or put automines on if I wanted the population to concentrate on terraforming.
I've had 3 problems with this plan show up:
1) The civies have gone wild with colonizing it, with no way for me to tell them not to. I've mentioned this in other threads - the new realization is that this would have happened even if I'd only wanted to put automines only on Venus, or if Venus were populated with Venutians, and I needed a colony from which to launch a ground invasion.
2) Since the colony cost is 40, there's (obviously) a HUGE ratio of infrastructure/pop. Apparently, infrastructure takes workers to run/maintained (as opposed to sitting there passively). On Venus, it takes so many workers that my "Agriculture and Environmental" category is 100%. In other words, I don't have any workers available to do anything useful (e.g. terraforming) - they're all busy plugging leaks in the environmental system. I understand how this makes sense in such an extreme environment, but from a game-play point of view it kind of removes any motivation for boots on the ground (plus why are all those colonists flocking to someplace where they can't make any money?). That's why I'm calling this a "feature" and not a bug.
3) I also have a 0-cost world, Olwa, a couple of transits away that I've been colonizing. It has zero minerals, so I'm making it a research colony - so far I've transported one lab. The it has roughly the same population (3.3 million) as Venus (3.

million. The major difference is that Olwa requires an R2 governor, while Venus requires an R6!!!! I suspect that the infrastructure is to blame here - it's probably counting as "installations" and making Aurora think the colony is more important than it actually is. This one is why I posted this in "bugs" and not suggestions - I think it's more a bug (or at least an unintended side-effect) than a feature.
I would propose that infrastructure not count at all for the governor's required rank, and (possibly) that its contribution to the environmental worker's load by cut by e.g. a factor of 10x.
John