The thumbnail cache should be assignable to be permanent in the "current contact sheet directory". This would allow, for example, the ability to store images on DVD and "instantly" access the thumbnails and files without having to take the time to build the thumbs. This is also a speed advantage when the images are stored on hard disk. The probable work flow would be to build the thumbs in a contact sheet hard drive directory then copy the directory with thumbs to the DVD for archival purposes.
If this is done, Photo Mechanic would be more useful in viewing "old images".
