A quick answer this this ...
andreamarucci wrote:1 - He want to have private galleries so that user john doe can access only his pictures that are uploaded by the admin at low resolution and watermarked. I think this is yet possible with the new "protect" system you've just introduces but maybe I'm wrong.
I am not quite sure exactly what the question is ... Why not just create a new page, and upload low resolution images? For example, just set the resizer to 600px so that images are small. Then you can have another gallery inside called /high/, where all the original images are uploaded, and the user can be given access after they have been given access through the "protect". You can even make a ZIP file available for download.
So this already works, and I am not sure how else you would propose for it to work differently.
As for watermarking, this is explained in a separate topic. You would have to watermark before upload if you require watermarking. In my opinion, if you use low-res images, then I don't see the point of watermarking.
andreamarucci wrote:2 - He want that each user can choose the photo he want to buy so that the gallery send to the admin a sort of "order" with the chosen pictures and the admin can prepare the pictures on cd, for example, to send it to the user. No need to have a payment system just "I'm interested in pictures #12, 15, 35, etc. please let me have them on a cd or usb key"
Yes, this is a request we Can consider for a future X3. It is a tedious task with lots of UI, lightbox, selecting and "send order" and is not something we will be able to prioritize for a while until X3 is public at least. Many photographers want something like this, but everybody has their ideas about what they want included, and some want e-commerce also.