Yeah they need to put it on the empire guide it needs to be updated I think the only place is on the post cow posted.
There is isn't yet sadly, but there are plans to; http://track.empire.us/issue/EMC-69 But, in the meantime, you can check out the new ones here http://empireminecraft.com/threads/new-residence-flags.23541/
ok thank you for that it is very helpful. However, i do not understand something else now. how do you set a flag that "cannot be used with pset"? is it just set?