accounting - no huntgroups

[Phil Mayers <p.mayers@imperial.ac.uk>]

I've never had cause to look at it before, but I discovered today that 
accouting doesn't support huntgroups; specifically, an attempt to match 
on Huntgroup-Name in acct_users

Is this expected? How does one normally specify Acct-Type based on a 
huntgroup, if (say) the Class attribute is already being used?