Thanks for the reply. What I am looking for is any information you can give about adding a custom theme. Is it a matter of copying the default theme and editing it? If so where should the copy go where the plugin can pick it up instead of the default theme where it will not be wiped out on updating the plugin.
The main tweak I want to make is for the text in the lightbox to use the default webfont used in my site.
It is easy enough to override the lightbox css in the WP themes css – which I have already done, however the lightbox’s default theme looks like it will still load webfont files for ‘Yanone Kaffeesatz’ from google fonts which will not be used anywhere on the site.
My goal is to define a theme where this unused font will not be called at all. Is this possible? If so, are there any brief clues you can provide until the planned documentation is ready?