I ended up going another direction because the former way I was trying to do it was a cumbersome. My goal with my 3 man team is to have the master mount a two-person mount, second slot targets master, interacts to mount on backseat, and slot 3 is a druid and takes care of himself. I made a two step map with WoW macro actions but not able to test it out until later.

Anyone see any problems with this map? If you ctrl+F it's named X-53 Touring Rocket"under Non-combat on my 2nd Character Set (Alpha)

http://pastebin.com/zgtjRUKF