Their is no official information telling people vehicle=possess.
QFT. Took me a LONG while to figure this out via forum posts of people asking "How do I use vehicles? EDIT: Nvm, found it" and not saying WHAT they found.

Second, took me a LONG while of fiddling with Posess to figure out that the action ID needs to start at id #121 and higher. I was using an older version of Macaroon and had to update before I could even GET to that number ID since the slider stopped on the old version at #120 (the last button in the standard WoW actionbar UI). (P.S. I've noted such on the blog page -- I had forgotten to mention that earlier)



Someone had asked me to write up a guide for Macaroon and I had been putting it off. :P This is the best I could whip up that day, mostly just because I was excited for finally figuring out a scalable way to update my DPS trinket upgrades.