I see "furniture" as a category on existing uploads, but it's not a category I can choose from the list when I upload or edit my recent uploads. Is this something that was missed on the upload form one of the times the site got redone?

Although we've always had 'Furniture' as a pick when uploading 3D Models and Art, we did not have this availble for Poser uploads.  We have added 'Furniture' to the Poser section so you can now select this attribute when uploading Poser files.  Thank you for the heads up!!