[Phanx]

Unfortunately MountMe won't solve the OP's primary issue, which is getting a dynamic icon that will show which mount or ability will be used before using it. The problem with that is that it's such a waste of resources to constantly calculate which ability would be used if the player activated the macro at any given time -- it could be the Nagrand garrison mount ability, it could be a random mount, or it could be an item, or it could be a travel form (or one of several forms, for druids) or it could be some other speed-boosting class ability. To keep an icon up to date you'd have to update it every time the player started moving, stopped moving, entered combat, left combat, entered a building or other indoor area, left the building or indoor area, or changed zones, as well as every time a generic "something changed" event fired for mounts, spells, and bag items, which can happen very frequently. I considered it when I wrote my addon, but very quickly decided it wasn't worthwhile.