I tend to play gigantic galaxies and have a couple problems overall.

First problem is having to select each of the improvements.
It'd be nice to have a set of scripts based on planet size that allow me to not have to double click each improvement. If there is a bonus tile I can still change what is built somewhere but an initial build selection would be nice.

Besides that, which I don't think is possible at this point in time, is something about factories.
New planets that need a big factory are a pain in the neck. Either you pay or wait a few years to have it built.
Is it possible to set it up to let you build either the biggest or smallest and have it upgrade to the biggest over time using each step along the way. Since (I think) you only pay the difference, this would be rather beneficial for all building types, and would let a new planet late in the game build up slowly instead of either building up over a few years or all at once from buying the buildings.