Master folder for multiple hard drives without RAID setup

So, have you tried adding all of movie folders on your various drives to your Movies Library and then just sharing that folder to your Popcorn Hour?

Movie Library is only available when using Media Center, isn't it?

I'm referring to the "Movies" folder in your Libraries. It's accessible like any other folder on your system.

But by adding files to the Movie folder, those files then take up space on the drive the Movie folder is located on.......

No, the "folders" in your libraries are just junction points. They are just references to the places where the folders actually reside.