I'm a bit surprised Valve is allowing add on weapons as this cs has a had a more ridged model. Though i'm still happy they have implemented the an items system in the game. Silenced weapons is a nice touch too!
I wish this wasn't just limited to big picture. I switch Steam accounts a lot (no i don't idle) and it would be great to have this in the main client. That being said, I am glad that Valve is continuing to support big picture and hope they add this feature to the main client very soon.