We haven’t experimented with passing coordinate parameters through command line arguments (I’m not entirely sure if its even possible).
Just to be sure of what you are looking for, please confirm my understanding:
You want to have a packaged executable, built using Cesium for Unreal, that a user can run as
myexecutable.exe --longitude 123 --latitude 45 and it opens up the globe to that coordinate location?
If this is correct, a follow up question: Why command line arguments as opposed to creating a UMG widget that allows users to enter latitude/longitude, that can be used with blueprints to set the location of the georeference?