AFCAD Editing

hello allif this has been posted already please forgive and send me in the right direction b/c i cant find it in the forums.Ive downloaded some good afcads in terms of parking but multiple runways arent in use for example at PHX..for some reason they all land on 8. How hard is it for me to go into AFCAD2 and edit this to make the planes use all of the runways? Could you point me towards a tutorial..im using RC4 which is great with sep. traffic once in the air..but on the ground i get the weird activity and AI smooth seems to limit my landings to a real slow ammount b/c of the holds i guess..any ideas/help?thanks