No, it's a great idea. By doing a lot of regular web browsing, you increase the diversity of users and usage of the network, giving more plausible deniability to everyone who uses Tor. No, SR is a hidden service. The connection is end-to-end encrypted from the Tor client on your computer to the Tor client on the SR server, and you will be using different circuits to the exit node and the rendezvous point. Yeah, pretty much. If you are viewing two web sites in different tabs, you will probably be using the same exit node and it can see both of them unless you use SSL.