[Plugin: File Gallery] Question for custom-attributes in Shortcodes

Hi,
many thanks for that great plugin!

I want to ask if it is possible to add one or some custom-fields with own attribute-names to the UI (insert a gallery).

I have started to script my own handler for Gallery-Shortcodes because I wasn’t satisfied with the WordPress-Default and also haven’t known your plugin. While searching and reading many pages about the WordPress Gallery I stumbled upon FileGallery and now use it with disabled Gallery-Shortcode-Handler. ( what saves me a year or two of coding ?? , because I’m pretty new to WordPress )

I use a HTML5-Theme with the PrettyPhoto-Slideshow and has to change attributes in the a-tags to avoid w3c-errors. The rel-attribute cannot be used like it was with HTML4 or XHTML. ( if you are interested in this, you find more here: https://dev.w3.org/html5/spec/global-attributes.html#embedding-custom-non-visible-data-with-the-data-attributes and some critical notes about it here: https://www.garretwilson.com/blog/2012/02/25/html5-data-incompetence.xhtml )

Best regards and keep up the very good work!

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