I suggest you add a sorting option for keys that would put keys that you own that have current access to the conquerable stations to the top of the key list.

The reason being is that these keys change a lot compared to others and when you start amassing a lot of different keys it is kind of a pain to have to go down the list to find the ones conquerable stations are listed under to see if you currently have access.

Preferably this would be in the hierarchal section where it actually lists the stations under the key.

Or at the least have keys with conquerable stations highlighted a different color to make it easier to see.

+1. As the list of keys grows it is getting harder to deal with them quickly