[VoiceOps] Voipmonitor Total Registered endpoints graph?

Hey gang, After seeing several very positive mentions about Voipmonitor here I have begun playing with the system. So far, I'm very impressed. The one thing I can't seem to get from it, though, is a graph of registered endpoints. Looking to trend the number of registered endpoints over time to show growth and/or to know something is wrong if we see the count drop off. It would also be nice to get a chart by UserAgent (I can hack this together with a csv export if I have to since that is just a point in time thing). Has anyone come up with a way of doing this? I appreciate it if you can point me in the right direction. Thanks, Pete P.S. What about SUBSCRIBE/NOTIFY/OPTIONS?