Are there any plans to add more functionality within the Lightroom Juicebox engine?! I have a couple of other 3rd Party plugins that do offer enhanced features so therefore I assume from a technical point of view it is possible. Isn't it?!
As far as I am aware, there are no immediate plans to incorporate Juicebox-Pro options into the interface of the Lightroom plugin, though it is technically possible and may be considered some time in the future.
If there is a certain combination of Pro Options that you use for all of your galleries, you could edit the plugin's 'juicebox.lrwebengine/config.xml' file and add the Pro Options as attributes to the opening <juiceboxgallery> tag so that each time you create a gallery with the plugin, these Pro Options are used and included in the generated gallery's XML file. This may save you from having to edit XML files after you create each gallery.