Matt, Haven't played much with MRTG, but you can configure cricket to get values from a program output rather than just SNMP queries. If you want to have a number of users, maybe a "radwho | wc -l" will give you the number of them, good as an entry for cricket.
datasource sessions
ds-source = exec:1:/var/www/cricket/tmp/countRadwho.sh
My 2 cent.
Jon
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