In the "Available Package Updates" portion of up2date, if the user clicks the 'Next' button without any checked packages, a transient announces "You must select at least one package." This might be an issue when the user doesn't wish to update anything, but isn't sure what process the application is following, and is proceeding in case there's more to be done. A clearer message would be something along the lines of "You must select one package. If you do not wish to update any packages, press the 'Cancel' button to exit the Update Agent."
this is a reasonable idea.
this has been implemented for a new errata release of update agent coming out this week.