I say take 2 of the 3 key items sections (70 slots) and change them to a currency only storage. Example items that could be placed in this would be totems, data logs, Eureka crystals, Clusters (cracked clusters), Rowena's various tokens and anything else that is used only to buy something from a vendor.

There are WAY WAY WAY more key item inventory slots than will ever be used. Lets make use of these for something else that consumes a lot of inventory space.