there is a program you can download called "cswap.exe" RAF Country Switcher that lets you change the ability to fight Americans(default) or British airplanes when flying as a german. I don't remember where I got it though so you'll have to look around.
Aircraft spawn only between their service times specified in their .xml files so it depends on how far you are in the campaing, but I will agree the campaign sux and many times only one type of aicraft will show for a long time, its just horrible from design
If that made any sense at all you should work for the CIA because I was just mumbling incoherently again
