1: Implement the "Wheel of worlds" idea
Basically it was a way of setting things so that the max pop of your worlds was a function of a raace setting. In your race options you choose a planet type that your race finds ideal. the farther a world is from your ideal the lower the population you can have on it.
Doing this would require there to be some concept of races in the game first, which is a rather significant discussion in of itself... So you're a bit ahead of the game there (and races are scheduled until v0.8 anyway...)
2: Make it so you can add things to a planet's production by double clicking on the planet picture. It's annoying to have to sort through 30+ star systems to find the one you want when you can go to the galactic map and click on it.
Uhm... you lost me. Firstly, it's not possible to "add things to a planet's production" at all... there's only one production queue for the whole empire, not one for any particular planet alone. But assuming you knew that and mean enqueuing something to be built at a paritulcar planet, then if you can go to the galactic map and click, why do are you instead sorting through 30+ star systems and then complaining about it? And do you mean actually add things to the queue to be built at a particular planet just by double clicking on the planet, or just opening the production screen in such a way as to allow further clicks to do the adding? ... It seems unlikely that a single double-click could ever be enough to do a full enqueue order which requires a location AND a choice of what to build, in addition to an ordering on the queue and possibly a number of things to build in some cases...