[Foom]

There's the more or less obvious stuff, like UI improvements, less micromanagement and so on. But for me, the most important things would be:

More actual diversity. Dom2 has hundreds of spells, items and troops, but after a short newbie phase it seems like only a fraction of these are ever used. It would be very hard to keep us damned players from doing this, but I think an approach could be made with some sort of a rock-paper-scissors system. Perhaps by dividing leader traits in three Groups (items slots, magic power, physical strength) and making sure no leader is ever good at all of them. Just generally make it harder to make a "best" choice that fits most situations.

More of the same, but better. Dom2 is a great game. Please keep everything that makes it awesome and only add things that make it better. This is probably harder than it sounds.