Well, he hits them at 35%, which is better than Chris Paul and Derrick Rose, although he doesn't come close to the number of attempts, but he doesn't have to because his shooting percentage is 52%, which is also better than the other two. So, I really don't think he needs to add that aspect, as it is already somewhat of a threat.
And defensively, the only point guard that is light years ahead of him is Paul, only because of the number of steals. And I don't put much into that because he gambles ALOT and is constantly getting beat. But with Griffin and Jordan behind him he is bailed out quite a bit.
I think it's a wash when you talk about Paul and Parker. The difference is Paul has the luxury of NOT having to be the main scorer on the team. Parker HAS to be the main scorer, at least for now.