Custom vehicles. A level can place a vehicle of its own with tag.
mjolnir level machine-collision --plan writes a CE vehicle's hull and tyres
into its collision, and mjolnir map pack carries the map's
vehicle_sounds.json.
A map's scripts and devices.mjolnir level bake carries a Custom Edition
map's buttons, gates and automatic doors, and mjolnir compile --names checks
a script against a scenario's names.
More game types. The Megalo tools write King, Oddball, Race and their
variants.