You can use path substitution to relocate your Thumbnails folder to the network - that's supported - just don't share one Thumbnails folder between multiple clients, because that's not supported.
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.
