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I tried to find if this suggestion has already been made, but I didn't see it if it exists.
I believe this would be easy to impliment and helpful to characters that rely on energy, cooldown, rage,etc..
In the second tab 'All Items', there is currently the function that if you left click or right click the check box next to an attribute, the box turns yellow, and the list on the right hand side reduces to list only the items with that attribute. I believe it should be added that the Right click on the check box causes it to turn red, and exclude items with that attribute. This would help greatly with the increased store size, and making use of all the available items as the gameplay calls for instead relying on finding the items a play already knows.