You can pass the directory to be scanned, typically I'd use this to scan a specific Season folder when a new episode is added, but you could try using the root of your movies or tvshows folder and see how far that gets you.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.