the first feature is a bold face lie. the only thing that does what it says, is auto post to group. if you do enable auto post, it posts as you, the admin, every time. If you're looking to buy you'll get messages from the dev, but soon as the money is sent, silence mode.
Well I have had this add on for a long time now and have never been able to get it up and running. It would also seem that xfrocks is not really doing any support on it either here or at XF. So overall rather a disappointing state of affairs all round.