Roll20 should be able to take the most common, user created tags applied to web based tokens/items and pre apply them to their related items.
Not explained well? Let me give a hypothetical example.
Lets say 10 people search for "stairs" via the 'Art Library'. After some digging they find these stairs
and add it to their library. As most people are want to do, they then tag them. Everyone has their own, semi unique tags, but they all use tags like 'stairs', 'wood', 'old', 'worn', etc. There should be a system in place that takes these common tags and apply them automatically. It would make searching for things MUCH easier as it would give us more accurate results (assuming the community tags are taken into consideration when searching).