Import Cameras, Alembic, FBX etc.
Being able to import a camera would be great. Not only if working on a whole set in SP but as well to check a asset from a specific camera angle.
Furthermore it would help to render for example a turntable or specfic camera for example to use a Object in a Mattepainting straight from IRay, or for a concept etc. There are a ton of great new things that could be done in Substance Painter with this feat. :)