Image time-gating
Please add a "Properties" UI for individual images in albums to specify specific playback criteria. This would be useful for creating visual "Soft-reminders" for elderly family members. For example, specifying that a photo can be included in a slideshow rotation starting at 12:30pm and ending at 2:00pm each day would allow me to make reminders to eat lunch. Behavior for time outside the allotted window would simply skip over that image in the slideshow. Specifying only Saturdays from 1pm to Sundays at 9am would allow me to make a soft visual reminder about Sunday shuttle service, and so on. Additionally, A 'retirement' date could permanently hide an image after a specified date until it is manually deleted from the album. This would make a visual calendar much easier to manage.
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Chris L commented
Addendum; Yes, I am aware of the reminders feature. It is welcome and useful, however my thinking is centered around using the slideshow as a visual bulletin board, with pertinent images appearing and disappearing in the slideshow rotation as relevant. Alarms would be both too obtrusive and too easily dismissible, and I would find this feature to be a bit more customizable than the reminder system because of the variety that I can make with the raster images themselves.