Is there a way to open up a merchant buy/sell window other than /keypress USE ? I don't assume so, and can't find one, but just asking to make sure. Because use will retarget the closest npc... and in the case of my macro, someone decided that right on top of my test merchant was the best place to go afk, with a mount out :/
[edit] Bah nm, found my own answer a few seconds after posting. I was under the impression /click right target required focus? I guess not anymore.

