I'd like to suggest two minor things.
1. From XMB you should be able to see if the Server is being used [Green Play icon/ Red PMS Icon] ( yea, i don't like the current ps3 icon =) )
2. You should be able to execute a batfile/command when ever the PMS is busy (streaming/browsing), and if PMS has been inactive for certain period, you can call anohter command/batfile..
The reason for this is to be able to suspend/quit other programs automatically when needed (utorrent)
What you think?