Meal and rest breaks would be easy-ish. Have a button in the driver app to take a rest break available every so often. If it's been too long, force it and don't show rides. Same for meals.

Callback, split shift, and reporting premiums only apply to my knowledge if the shifts are scheduled. I guess it depends if they go towards scheduled shifts over show up whenever, and/or if they can make it 'i'd like to work: yes/no'