Part 1... Variables
I am just wondering what all the pure chat variables are.  I know the following two.
        {operator}
        {user}
are there any others?

Part 2... Suggestions
Can I suggest a few things

1. chat rating should be easier to do, I dont like the fact that the user is asked to "Cancel" an action in order to rate the chat... there shoudl be a "rate" button in the chat window which allows the user to rate BEFORE exiting the chat.
2. User Options... The user should be able to request a chat log.  often the operator says something that they need to remember, It would be nice if that information could be sent to them in an email