The command line release import and/or source control are necessary to automate the deployment between environments (dev -> test -> prod), I am personally really looking forward to it.
Currently the less painful solution is to create packages manually, export the releases, and import them manually into the other environment. Otherwise you need to create a list about the separate elements (currently available objects to migrate automatically in 5.0.34: process, object and probably queues and schedules) outside of BluePrism Release Manager. In this case you need to create your own scripts using your own lists (obviously the list can be generated from the content of a .bprelease file too). AutomateC.exe /help provides the full list of the available options in the command line.