The manufacturer decals will come with the 2011 patch within the next month or two. This is straight from the developers. They've been putting a lot of time into the 2011 Car Model and everything that goes with that, so some of the smaller details with the 2010 Car Model were left a bit rough around the edges, I believe.
I wouldn't really critique the Paint Shop feature until the 2011 content is in the game later this Spring. I'll be racing long exhibition races until that content hits.
So excited.