let it be known that HFS shares bandwidth between connections, and not between addresses, that is you get more priority as you use more connections.
(please, notice that more priority does not always mean more speed)
so, the number of different addresses it is not always a better indicator for server load.
anyway, i don't understand if you are asking for a change in the status bar of HFS or a new symbol to be used in templates.
in the latter case, i can put a symbol for number of addresses and for number of addresses actually downloading (not just browsing).