Story mod.

Okay, fine, visuals, mechanics, but please, no off-topic discussions.

I completely agree! If we are discussing Heroes **5**, then suggesting mechanics and "temporal segments" from other parts of the game (which some consider appropriate, while others don't) doesn't make sense, because the question was asked by the topic creator very clearly and understandably. And I'll say this: I would be very interested in such a mod, and I would gladly try it out.