(This is my first post here sorry if I do anything wrong!)
Ok here is my suggestion:
When doing a realistic flight Ex: United KSFO to PHOG and you want to have United (number) as your callsign you have to scroll all the way down the list of different airlines and callsigns to choose from.
What I am proposing is that there should be a search feature so you can quickly find the callsign you want!
(If I did anything wrong please tell me)