For extended-handling stops, increase the Time per stop or the individual stop's service time so ETAs and Max route duration account for the extra work. For two-person deliveries, note that a route is assigned to a single driver account, so you'd staff that route's vehicle with a crew operationally rather than assigning two driver logins to one route.
Driver Tasks can capture crew-specific steps at the stop. Works in both EasyRoutes for Shopify and EasyRoutes for Web.
See: Route Options · Driver Tasks