I am going to catch a lot of flak for this but I would like to have an interactive ATC at friendly bases. Don't throw your coffee mug at the screen, keep reading, it will all make sense in the end and quite possibly solve a couple of issues as well.
When approaching an allied field it would be nice to have to communicate to the tower for landing clearance prior to actually landing. I know I know, why? For starters it will help reduce the number of AAA hugging monkeys that people constantly complain about as it will provide a way for 8.8's to be a bit more useful at range in a more realistic manner by requiring the sign, counter-sign to be initiated starting at the 8.8 max range. The pilot would have, let's say 10 seconds to declare who he is before the 8.8's open fire. If the 8.8's are down, then the sign, counter-sign would be initiated when target is in visual range of any allied field. If the pilot fails to declare himself to be friendly, the AAA will open fire at max range.
A feature could also be added that would allow a very small chance that an enemy would be able to trick ATC in to thinking that they are friendly and allow them to hit the field without being fired on by auto AAA. I do mean a very very small chance, something like 1 in a 1000 chance.
There would be a catch to allied pilots as well, if the allied cat doesn't identify himself, the AAA and 8.8 treat him as if he were a foe and opens fire.