First thing: Integrate the new planetary governors into the colony list in the colony management screen under civilization manager. For a function of this magnitude, a hotkey is insufficient. Even pairing usage of the hotkey with scrolling through the planet list brought up by if memory serves F1 is slower than it ought to be, and not much better than simply not using the governors in the first place.
As a note, using the shortcut from the colony list does actually bring the screen up...it just happens to bring it up UNDERNEATH the colony list screen, so you can't see that it's actually working. If the screen simply came up OVER the colony list, then that should fix the problem there and actually make this awesome feature workable.
As for leases: There is, if I remember correctly, a colonization event that gives a pseudo-random amount of InterestRates ability-I've gotten as little as ~10 or so, and I've gotten as much as >30. It doesn't happen often, but it happens enough that, given that there are two trees in TA that can reach 50% by themselves, it concerns me that someone might reach the point where buying on a lease is actually cheaper than building.
In addition to this, it would be nice if the 25% InterestRates ability actually worked in DL and DA; at last check, which was not more than a month and change ago, they did not, and to my knowledge neither has been updated since.
I would personally love to see the starbase hopping bug fixed, but Kryo has deemed it not that big of a deal. I have challenged myself to sit down and play a game abusing the shit out of it to prove it, but I've been a little busy in real life as of late. In any case, I understand that it's not a high priority.
I have to agree on the mining. The first level is the only one remotely worth doing. However, it is also of course possible to make them too overpowered as well.
And while we're at it, please tell the AI to instantly change its currently researching tech when the plague/disease event pops up. Or if you've already told it that, then make it listen this time. I understand that the plague/disease are supposed to be big events, but they shouldn't be handing the galaxy to the player on a silver platter, which is what they're currently doing.