feature request: wallpaper cycle on login

[torzod]

i enjoy having several wallpapers in rotation, but i find it unpleasant having them change while i am actively using my computer. ideally, i'd like them to cycle every time i log in or unsuspend my computer, so that every session i use my computer i have a different wallpaper. setting a timer to cycle would inevitably lead to the wallpaper changing while in use, regardless of what it is set to, as i don't use my computer on a consistent schedule. potentially having an option to disable changing wallpaper on unsuspend may be nice, as having it only change on login would lead to less frequent changes on days where i am up and down from my computer frequently.
thanks!