Thanks for your feedback. The QuickTime videos I have seen that do not work out of the box with GSP are those that use the legacy H.263 codec. The default codec for .mov files is currently - and has been for a few years - H.264, also known as MPEG-4 part 10. These should work just fine in GSP.
The trouble with using QuickTime for all .mov files is that it has a much lower install rate than Flash, and many users are in environments that do not allow the installation of plug-ins. Also, in my experience QuickTime has been buggy and difficult to deal with in a browser context.
As we have previously discussed, it is easy to revert to using QuickTime for .mov files with one of these changes: (1) Rename the file to .moov (2) Set MimeTypeValue to 'video/quicktime' for the .mov record in the table gs_MimeType, then recycle the app pool. I believe that, all things considered, this is a good compromise position.
Thanks again for sharing your thoughts. I appreciate it.
Roger Martin
Creator and Lead Developer of Gallery Server Pro