Well I searched for this and didn't find anything.
While doing the SSO daily Don't Stop Now I was aoeing mobs and had gotten more keys than I needed to complete the quest. Usually they will disappear once you turn in the quest. If you drag the extra keys from your keyring into one of your normal bags, the keys wont disappear. This is quite useful since the keys have a pretty crappy drop rate.
Pretty simple but saves time IMO.