1. yes you could.
2. exif is stored as an array in an another table and is not searched
3. It is medium difficulty to modify pro. You do need to have some minor php and html knowledge to play with things.
4. We give alot of examples on our main page. Our application works in all kinds of environments and one of our site clearly has lots of categories and almost one million photos. Loads very quick and nice for me
Main Index - Trackpads Gallery
5. Currently in Pro no. In vbgallery yes you can import and pro should import
vb albums available soon. There is no reverse import but then we dont delete anything under the
vb albums so there is no need to import back to
vb.