This is more specific to standard based on the number of planets, but there are 20 spaces (for planets and moons) in the dropdown menu, after purchasing a ruby planet I have 1 moon that I have to scroll to reach (yes I'm yet to get my last moon ), I took a brief look at the html/css but didn't find where the limit might be set (so that I could customize it for myself).

If the size of this list could be increased by 2, I (and possibly several other players in Standard) would be very grateful
(Or even just point me in the right direction to adjust this myself)

(Sorry to the people who wanted the details about my fleetsaving etc.)

A good idea, I agree. It certainly can be a pain

I did a little more research, and it doesn't appear to be a simple fix (from our side at least), I could look into writing a script to mess with it but I have a feeling that falls in the tiny grey area between changing the appearance of the page and "Thou shall not automate the game".