[quote=Green]
I don´t mind the limitations. I mean, I don´t fully understand them, but somebody has to do the job, and it might as well be me.
[/quote]

Well let me put it short, these are the limitations of a commander:
1.) Can command only one hero.
2.) The said hero must be primarily a support role. (Doesn't matter if this is a mage, cleric, archer or anything of the sort, so long as they belong behind the front line)
3.) Cannot have any regions besides if chosen for the capital commander. (In which case they can command two more heroes)