I've receantly finished something like sigershader mat library . it is currently in testing phase (works flawlessly, but testing UI and adding features).
-automatic thumbnail generation in the background
-everything just works
if you or your comapny would be interested let me know and based on feedback I will make public version or at least "demo" (current state with , permanently set default folder)
send me a PM or hit me on miki.hons@gmail.com