I'm excited! I have two more suggestions/questions:
4. Early warning/RADAR detection and integration into plan execution. With this you could simulate Launch Under Attack and explore the influence of asset basing and RADAR sites on strategic stability.
5. Bomber interception. Related to 4, and I know you've been asked about ABMs in the past, but fighters and SAMs are a lot more plentiful and capable of intercepting bomber missions compared to anti-ballistic missiles. This would allow you to look at standoff capabilities in more detail, for example.