could use more scenery: villages, highways, farms, factories
and if you do plan to add more scenery, i recommend doing it at the earliest because the performance of the game, it will take time to reoptimize
All the expected stuff
Infinite resources
Infinite administration
An ability to control AI relationships (also with others)
Instant upgrading and building time
No workers required for building and free building (no resources cost)
Ability to convert hexes/tiles as your will (optional)
Infinite health to units (but they will have disband button which will destroy the unit)
That's my guess