your right craved r31s use mac struts and you can adjust camber though the top hat, but you cant adjust track. plus adjustability is neat, id hate to make a set of arms up and find out they are way too long or short. im keen on experimenting on what the cars liek to drive with it and with some fiddling to set it right.. plus the whole wanky drift cred yo thing
these arent going in a road car so engineering isnt really a concern.