screen time enhancements

Anyone know how I can request enhancements (i.e. feature requests) for screen time? I would like there to be an option to add a custom amount of time vs 15 min/1 hour/all day. Also there are certain apps I want enabled all day except for downtime. For example I block games until after school but I want text messages or discord available in school. However I found out the kids are texting past downtime as it is "always allowed". Is there a way to allow browser but only certain websites in always allowed list?