Maybe, I could create a plug-in able to import/export preferences, furniture and textures imported in catalog. Is it what you look for?
Or do you prefer I create a "portable" version (I don't like this name since it's confusing with the fact that Sweet Home 3D can run on different systems) able to run on a USB key for example?

get rid of converting everything to jpg, it really sucks...

Everything is converted to PNG since version 3.3. Please update your version.