It's pretty close, not sure on the corretc syntax though, maybe:
/use [button:2]
petattack /cast Hunters Mark
or maybe you can use /cast on petattack too? worth a try.
Edit: You can use conditionals on petattack:
/petattack [button:2]
Edited, Sep 28th 2007 12:21pm by PASSENGER OF FOOT HEAVE IN SIGHT, TOOTLE THE HORN. TRUMPET HIM MELODIOUSLY AT FIRST,
BUT IF HE STILL OBSTACLES YOUR PASSAGE THEN TOOTLE HIM WITH VIGOUR."
Armory
