Yeah, it's kinda a pain in the ass to run it past Snow Leopard what I understand. I still use it for a lot of my basic edits, because it's such a great program, and it's the first one that I really learned how to use (way back on FCP3 express!)
If you can, just torrent CS5 or CS6. They'll be far less of a hassle in the longrun...
Have a nice day, Bluename.