Adding an 'Extended service area' to the edge of a service area boundary is easy and recommended!
FROM THE WEB APP
Step 1: Go to Settings > Service Areas > Select a service area or create a new one.
Step 2: When editing a service area select 'Extended service area' and add a desired time in minutes you are ok traveling outside this service area if you are already scheduled near by.
Step 3: Save & Done.
FROM THE MOBILE APP
This setting can only be changed by logging into the Web App at this time.