Allow a Default Slider
Allow user to set up a "default" slider. Using a checkbox (true/false) where the person selects that this slider is the default meaning that if no other slider is scheduled to run during that time the "default" slider runs automatically. This way the user doesn't have to worry about remembering to set up another slider in between sales/promo sliders, which at our company happens often. The current process is time-consuming and if someone forgets to set up a slider the whole site looks horrible because no sliders exist.
Admins shouldn't have to worry about the entire site having a different look (poor user/customer experience) if any employee got busy and forgot to set up a new slider to run for a few hours until next sale slider begins. Poor design/experience for both admin and customer/front end users.