It's a BETA-version ... and exactly meant to reinvent your discovery spirit.
UserMan is and was a radius-implemention so adressing for clients, is done with radius-attributes.
Not shure which features you are targeting on ... but that worked with a lot of versions before 7.XBETA.
So stage your lab ... and produce some pretty PDF's ... when you're done.
recommendation: peek at the new implemented dhcp-vendor-class stuff ... pretty things possible for VoIP and Wlan-Environments
We know what happens to people who stay in the middle of the road. They get run over.