With the implementation of Avatar's Favor, there's one command I'd love to have to go along with it. The ability to park my Avatar in place in a passive/non-defensive state. For instance, if I want to give my Ninja friend Garuda's Favor while he's tanking I either have to stay within range of him to grant favor or I have to engage Garuda on the monster which he may not want me to do.
Also, Avatars sometimes have the habit of defending the Summoner in situations where he or she may not wish or actually need to be defended. A Stay command would help with this as well.