i was qued up for AV one day and i got on my mount and went to go to zep then AV poped up and i entered the battle. when i got into AV i was already on my mount......... so thats like an extra 4 sec for you to get a head of every1 else I use it on my horde i dont know if it works for allies
Anyway just que for AV then stay on your mount then you will be mounted in Av :D