This page should give you a small demonstration about what is possible with just some changes in the CSS files.
To achieve these results, you need to change the TS to
plugin.tx_rgsmoothgallery_pi1 {
pathToJdgalleryCSS = EXT:rgsmoothgallery/res/css/jd.galleryColor.css
pathToSlightboxCSS = EXT:rgsmoothgallery/res/css/slightboxColor.css
}
These things got changed:
All other settings like the opacity of the thumbnails and hiding the InfoSlideZone have been done in the flexform configuration.