Travel/ prep time built in

It would be great if travel time could be automatically added on either side of appointments- when an appointment or task is entered there is an option to choose time blocks: 15, 30, 45 minutes, etc. that are added either ahead of the task (in case of prep time), or both before and after the task (to account for round trip travel time). I would like to visually see the start time and duration of the appointment, so adding travel time to the event would make it all one color block. And manually adding travel blocks before and after just takes more time and effort! Thanks