I guess I miss the Combat Arena where players could offer their own maps and settings. It was fun doing everything from seeing who could jump a M3 off a cliff the farthest, doing battle using unusual plane sets like B24's against B24's (or jeep wars) or maps set up for Air Racing.
The small maps made for some pretty intense (and fun) 8 person battles.
If I remember correctly the only thing I couldn't change was Icon settings. I really wanted to try that out to see how it felt.