I don't allow Timber on my shoulder either for much the same reason. As to your questions about interaction, I have a mobile playstand so that Timber can spend time in the same room with me. He does sit on my arm at times. However, mostly they just want to be in the same area of the house that you are, where they can "see" you. Interaction also refers to talking to them and whistling back and forth. When I am with Timber I am often talking to him (even if he doesn't respond). If I am silent for too long, he will speak or whistle to get my attention. When I am doing things around his cage, like cleaning, changing bowls, whatever, I tell him what I am doing.