Sadly, I think what we have is the best we can hope for. The previous idea floated by Turbine was a consumable scroll that would halt XP for a set amount of time, similar to other buffs purchased from the store.
At this point in the game, post f2p, not very much is going to be added unless it will turn a direct profit. WB can't put a number value on customer satisfaction, but they can see that X number of Stones of the Tortoise have been sold.
Luckily, the other goal seems to be to make the game so easy that you can be successful wearing no gear at all, so missing out on a pocket item isn't at all noticeable.
[color=red]Work like no one is watching, dance like you don't need the money...[/color]