It is a common and desirable feature to be able to select predefined custom date ranges such as Today, Yesterday, Last Week, Last Month, etc.

This could easily be implemented in the current DateRangePicker if additional templates were provided, such a FooterTemplate, or StartTemplate / EndTemplate. That would allow the customer the most flexibility to implement this or other.

Putting these actions into a separate dropdown outside the date range picker is not ideal from the UX perspective.