Road Trip Summary - add start and end time

The Road Trip Summary feature is great.  It would be useful to enable the entry of a start time and end time in addition to the dates so that you can bracket the data to exclude any data not part of the road trip.  An example of why this would be useful is to exclude any personal driving data before commencing a business trip you might want to use this feature to document.  Or, if you are planning a multi-day road trip you want detailed stats for that begins in the evening, you want to exclude data the outside the trip itself on the day you leave and return.