When uploading a model there's a number you can choose from. Most important types of catagories are there. I upload a lot of scans of fossils. And while there is a good catagory for some types of scans, like archeology. There is no good catagory for fossils. Only 3d scans/science kinda fits. But that's still pretty vague.
So what I'd like to see is a 3d scans/paleontology catagory.