Is it possible to modify the game? (Read more inside)

Well, in Heroes 5 – Hammers of Fate, there’s a function for the Haven faction that allows you to transform your units into other units, like turning a Peasant into an Archer, a Monk into a Cavalry unit, or a Griffin into a Cavalry unit (you can’t turn anything into an Angel). You can do this infinitely, the most important thing is to have enough gold. And in Heroes 5 – Tribes of the East, you can transform 15 creatures in just one week. Is it possible to change this so that in Heroes 5 – Haven, it works like in Heroes – Stronghold? So, also with infinite transformations?