Reworking the creature composition in towns.

And here's another point… How do you understand “The only thing is that such fantasies are not so useful from a practical point of view…”?

Let’s put it this way: it’s much easier to come up with faction compositions than to make the corresponding changes by contacting the developers or creating a mod.
/topic/11443/ – these guys are working on a global mod for Heroes 5 and are actually making progress; they develop the details of their mod as they go along. Given limited resources, this is especially appropriate because there are many pitfalls, and sometimes there isn’t even a technical possibility to implement something within an adequate timeframe and with reasonable effort. Although some minimal planning is also necessary, of course.