[Edi]

1) There is no #order command, it has been in wishlists as a feature request, but it does not exist. There is also no way to downprioritize magic without modding spells to have greater casting cost or removing certain spells. AI mages always cast spells, they never melee by choice.

2) Not done. The Conceptual Balance Mod (CBM for short) alters a lot of things, but nobody has done a similar modification of national unit lists.

3) The mapedit.pdf in the Dominions3/doc folder will tell you map commands. The document is fairly barebones, but there will be a more detailed one in the next patch.