MASON is much more low-level than the descriptions you're providing. It
is a high-performance "swarm"-style massive multiagent system, and does
not provide domain-specific stuff -- that's up to you to provide.
As such none of the questions you're asking are really relevant except for:
> Simulated Entities
In addition to various basic facilities, there are add-ons to MASON for
doing rigid body physics modeling, social networks, and GIS.