The reason not to just allow everything to stack to 99 it the Auction house. If everyone had to wait to sell 99 crystals there would be less on the market and the over all price would rise to the point where it would become difficult to craft. In the AH you can sell singles or stacks. If they made it so clusters sacked (even just to 12) and you could make clusters form stacks of 12 crystals. It would help a lot for crafting. there are other items this could work for as well. ie stacks of lumber could turn into cords of wood that would again stack to 12. I know SE needs to look at the balance of the economy of the game to insure is will not go haywire.

As for auto crafting it would be nice if there was a repeat button..