This warning can be turned off after a definite number of times the like the bounty hunter and wilderness warning. The same it can be turned back by the Doomsayer in Lumbridge. Tell me what you think. The reason members can't access it is that this may then be used as another bank. When you become members a message will appear stating"The items on your Temporary Bank have been transferred to your normal bank."
The Location is actually up to Jagex. I just thought of a falador house off the top of my head. A"Select and choose" style for if you would like to sell a number of them on the Grand Exchange. This would work the same as Coinshare in which the Item sells to the industry price. EXCEPT If no one was purchasing a message would look stating"Oh Dear! It seems that nobody is buying your product (s) for the industry price. Would you prefer to go lower?" If you click Yes The thing (s) will decrease in price until they sell or reach the min. Price. Clicking No! Will finish it.
A feature on which I want to see enhanced, would be the movement which the Runescape participant can use. While I say motion, I suggest'point click'. Line click is a regular element in a MMORPG, but it is just bugging me about how they created it.