…after the 9th picture I couldn't upload any longer, so 9 (or 10 including the single one already there) seems to the the limit. Is that correct? And, if yes, why?
Yes 10 is the limit and probably will always be the limit from now on. Programs like Imagegrabber can make a contact sheet of the scenes in a video. If you already have alot of pictures then picture programs like ACDSee will make a thumbnail sheet for you. That should help cut down on the actual number of images without losing the actual images themselves.
Part of the reason why it is limited to 10 now is to prevent the problem of server space in the picture folder from becoming a problem again. If you notice when you upload pictures they get stamped with a "www.gaytorrent.ru" label in the bottom right corner. That process requires that they are stored in a specific location. If it gets full, there is no real easy way to just move them somewhere else.
I will ask again about the ability of multiple pictures being uploaded at one time again but as I said in my first post, there are things higher on the to do list right now for the admins and they are working really hard to get it accomplished.