I don't know if this is a Steam thing and if it'd have to be done on their end...
But, I think that having tags for items in the Steam inventory that fit the categories we see in our SK inventory would be nice.
Example: All swords would have a sword tag, all iron lockboxes would have a "usable" tag, all keys would have a "Key" tag.
Discuss, if needed.
That's something on Valve's end, not OOO's.