i just tried mine(aint played IC on AoD in a long time) i also have just 5. I normaly play IC on DH i find it better and you can set your teams upto 50.
EDIT: I just found out how your meant to do it but i dont think it works with the version, you open Parches Hoi2-AoD then hit patches(might wanna change it to english at the bottom) then you select AODGame.exe and then type 10 into the box on the right, hit patch it and if it was compatible it would do it but mine says its incompatible.