That’s not possible. How would the transitions between backgrounds look? Also, apart from the technical issues (.jpg vs .tga), most of the new backgrounds are way too distracting to be used in the galaxy. How many planets do you see here?
Inteded. Score is tied into so many other things (competitive missions, tiers, hall of fame), I thought having a score goal would be redundant.
Fixed in v.120 
Bug
They generally already say that (if it’s appropriate). It was indeed missing in one description, but it has already been fixed in v.120
Apart from the technical difficulties (I don’t actually know your rank unless you are logged in), I don’t think it would work in all languages (those that have “cases”).
Update: I have now renamed “Recruit” to “Janitor” to reduce confusion.
You can turn them off entirely in the galaxy menu.
Granted, but I want the warning line to be the same color as the actual beam. Besides, there’s always going to be some warning color that will clash with some background.