It would be great to have the ability to watermark just one gallery of your choice. For example, we are sending a commercial gallery to an art director for a website he is designing that hasn't been retouched and want to watermark the photos for his selection before we do our final retouching.
You can actually do this, however the process is a bit reversed.
You'd have to activate watermarks, and then every gallery will be watermarked. You can then however go to each gallery you DON'T want watermarks, and go into "Edit Event," "Advanced Event Settings" and uncheck the box that says "Display Image Watermarks"