I think that KISS autograph time conflicts with their panel.
Anyway, I've had two different experiences getting Shatner's autograph. The first time, he didn't interact with fans at all, he didn't personalize, it was just sign, sign, sign, without even looking up. The second time, he chatted with fans a bit and personalized. It's hard to say which Shatner will show up. However, his autograph is normally $80, so if you can get it for free, that's a good deal.
I doubt he's going to pose for photos. When he does professional photo ops at cons, he's usually sitting on a chair or stool.