Fixing scratches in Leather seats
#2
It's possible. We had a leather sofa that our cat scratched. We had a professional leather repair person come to our house and he had some kit that fixed the scratches. When we got rid of the sofa some 15 years later, the repaired area was still holding up fine.
#4
Try these guys. They make good products and have a lot of info on their website, even if you decide not to purchase, the info may be helpful. This link has specific about repairing leather with cracks etc (scroll down a bit). I've used the conditioner and cleaner only. I will probably do a re-dye for our BMW driver's seat at some point in the near future.
http://www.leatherique.com/do_it_you...e_leather.html
http://www.leatherique.com/do_it_you...e_leather.html