Progress: It's fully possible to change type of a unit. For example royal pikemen can be called heavy while phalanx pikemen are called spearmen. I seems like choice of class for the unit does NOT affect it's combat stats, which means this is a valid way of creating the desired group formations. There are however some other complications. First of all - there number of unit types is very limited - heavy, light, missile and spearmen, I think, which limits the possibilities a lot.
The other problem is a little bigger - the game says it's NOT compatible with vanilla in multiplayer when I've made these changes! I don't know what algorithms in the R:TW engine is used to check compability, but hopefully it'll be possible to override that. Anyone who knows? If it's determined by last edited date or file size etc., it'll probably be possible to fix by "hacking" the edited date or changing file size by adding nonsense comments.
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