For the next game, especially if it is in the early modern era, would it be possible to create a combined unit consisting of two different types of soldiers.
For example, a Spanish Tercio. You would recruit a Tercio and on the battlefield it would have a mix of pikemen and musketeers in it. You could set it as a square and the musketeers would automatically retreat to the interior of the square when enemies came close.
Or a knight-squire unit. Historically knights and squires rode in together and fought side-by-side.
Militia unit with a mix of spears, swords, clubs.
The possibilities are vast.
Having unique units composed of two different soldier types would be an innovative experiment making for some fresh and interesting game-play.