The screensaver running before screen locking allows a slideshow with wallpapers/images from folders. It would be great to improve the screensaver settings and function like glslideshow from package xscreensaver does. It needs - a test/preview button - a pan/zoom for images - a crossfade duration between images - show different images on every monitor for multi-monitor setups
This is out of scope.
This is working on other Operating Systems like MacOS and Windows and it is working in xscreensaver (which does not work together with kscreenlocker) - so why do not improve plasma screensaver to have a great appearance for KDE plasma that satisfies its kscreenlocker design? I know, it's not that important, but it would be really nice to have. Many users wonder why KDE screensaver is so basic and boring...