I seem to recall there are macro/UI commands that involve buying from a vendor.
Now... My question, which pertains to a possible exploit, is this:
Can you write a macro or add-on that allows you to buy from a targeted vendor within range WITHOUT opening the vendor window?
The basic idea is: Vendors who are in combat and opposite faction mind controlled vendors don't open a vendor dialogue. But there are some fun applications possible IF a macro allows you to buy from them without opening a window.