Similar to how listing is done, would it be possible to scroll through planets in the planet page ? You know, to save that few extra clicks, just click and it will go to the next/previous planet.

Have it so youc an choose to go through all, foreign, enemy, neutral and owned.

you can they are called filters

That's entirely unrelated.

+1 to the idea; it would make looking for a planet owned by a specific person much easier.