Assign files and folders to a virtual folder and mount it to be accesible for the file system.
We are dealing, at this moment, with +75.000 files in multiple locations.
1- only files are to be listed, when a folder is dropped to the VF this has to add (recursively) only the files.
The result is just one VF with only files inside.
2- automatic synchronize (or user dependant), for new or deleted files on the original folders.
If anyone has used Directory Opus, it's a little like its Collections feature, to get you an idea.