As the person above said, I'd love to see Rick get involved in more. I think you've got a characterisation that is spot-on for Rick, although I do say as a fair warning that I gave up midway through Season 3 when it made me cry like a baby. (Whatever, this show.)
I think Officer Friendly is dong fabulously with all kinds of interactions and on the whole really the only thing I could say is that I want to see more. Like, I love everything else, and I just want MORE. But I'm greedy like that.