If the curb rash is just in the coating you may be able to sand and polish them. Damage to the metal would be a bit more work.
The Ross-Tech VCDS and cable is really a great value considering features you can enable and the diagnostic capabilities it will give you. I've actually just opted to order my own. Having it around would give you all the time you could want to play with tweaks. If you only want a couple of quick things done you could contact somebody nearby with the cable and software. Check this thread: http://www.a5oc.com/forums/audi-a5-s5-tech/29551-vagcom-find-local-a5oc.html
The Ross-Tech VCDS and cable is really a great value considering features you can enable and the diagnostic capabilities it will give you. I've actually just opted to order my own. Having it around would give you all the time you could want to play with tweaks. If you only want a couple of quick things done you could contact somebody nearby with the cable and software. Check this thread: http://www.a5oc.com/forums/audi-a5-s5-tech/29551-vagcom-find-local-a5oc.html