Many metrics can be displayed in UXM Charts but it would be very handy to have Fullpage Response Time as well. It would answer the question "how does the whole page download time evolve over time ?". For now I believe we can only get that information in a basic way from the Monitor Summary.
Here you can review submitted feature requests and vote up the ones you like! If you can't find the feature you want - go ahead and suggest your own idea. Ideas with the highest rating can be implemented in the product.