We are wanting for normal users to be able to change the priority of existing tickets. I know when the ticket is first created they can change it from the website, but not after it’s created. It would be better if we could do this based on the ticket team instead of a global setting to just turn it off or on. I have opened a case already (ticket # 648442) and they have added it to the Wish-list, but I want people to up-vote this as well so maybe it will get help push the request along. 
