1. I can't say that I know about that.

2. If it's important to control both sides, I'd recommend setting it up as a multiplayer battle, with another person controlling the opposing army.

3. Aesthetically speaking, the early-period troops all have a very Dark Age aesthetic, and the Danes have access to suitably Viking-looking infantry, archers and cavalry. There is also a Saxon faction available in custom battles, and they'd be a good bit more accurate than the (Norman) English faction.