this IS avaliable with WLM, with a small change.
with WLM you can group by status, and it is by STATUS!
it has the 2 standard groups: "ONLINE" and "OFFLINE"
but when your online contacts are set as "AWAY" "BRB" "BUSY" "ETC" they drop to the bottom of the "ONLINE" list, in an order - i still havent worked it out
{never tried to!} but they are grouped by "BRB" then "AWAY" or in another order - not sure - though still under "ONLINE"
hope this has cleared things up for you