All of my content (prior to moving to Sapphire) was organized into to directories: TV and Movies. Since tv episodes never went into the movies directory and vice versa, importing data in Sapphire was extremely slow until I realized I should mark my movies directory to not import and then import my TV shows, then vice versa. At this point, I think I'm in a good position to add content and update my imported data fairly quickly and regularly as I add content.
BUT a big hurdle for new users is importing hundreds of gigabytes of content. Most people DO organize their content into folders "TV" and "Movies" (or at least most people I know do). This would be a great feature to assist people in their initial import, to be able to denote directories as "TV" or "Movies", then the import tool for TV would skip the movie folder(s) (and vice versa).
PS: I love Sapphire!! It is an AWESOME plugin!! You folks rock. Just fyi.