Is it possible to add a link to a specific image in the Gallery Slider? And remove the "Lightbox" feature?
I'm afraid we do not have an option to remove the lightbox. You will need to customize the theme files to achieve this. You would need to change this in several places of the code as this is a general feature of the theme.
you could try and open up the file Themefiles/js/scripts.js and delete following highlighted JS code.
Best Regards,Hina S.Theme-Canon Support