Fastpath - any examples of customizing webchat?

I see in jivelive.jsp there are a couple of other macros for providing interfaces to fastpath. Are there any examples of extending this for other cases? For instance, we already have the userid and email address of the user in hand prior to calling the showChatButton function. Would like to send that information along and not have the user see that or at least have it pre-filled. Any documentation that gets into this type of customization? Thanks.

I would like to do the same thing. Any updates on this topic?

I want it too.