Pay will not get added because AH is seen as a ‘safer’ way of trading. The ah fee is pointless, as there is already a limit on the number of items you can post. If anything, the ah fee discourages the ‘safer’ way of trading.
Support I also think you should be able to ah beacons and spawners. Because it's easy to scam people because you have to buy a item on ah then the other person has to toss the item.