Please add an option set as login screen when right clicking on an image file. At present to set login screen on needs to go through a couple of menus which is not very good user experience.
Only Plasma knows how to set a lockscreen wallpaper. It _could_ offer a service menu addon, but I think it is pretty niche, and is better exposed as a third-party addon.
Thanks for the info. I'll resolve and look for a plugin option.