skallben
Diplomat
All the features that makes the the world dangerous and interesting to explore are what makes FFH for me. The survival/reconstruction phase after the Age of Ice is what makes the imperial phase epic and IMO it would be even more so the harder it is to get there. Time Victory is an absolute must to disable in my games. I run with Living World, Raging Barbs, Barbarian World and "Raging Wildlife", forgot it's name 
Maybe it's just my setting/playstyle but I want every new city I build to be a challenge to achieve. I absolutely loved the kind of power Barbatos could extort over my progress but I can see as he how him being unique combined with his power making him unbalanced. However I would love to see minor civs acting as tribes being in the way of all civs. Make them at peace with the Barbarians, unique and slightly more organized than the random barbarians. There is an FFH-adaptation of Jdogs Revolutions being made currently, the BarbarianCiv module would be awesome for creating this. Have a Barbarian city build a wonder that spawns the Sailors Dirge and LeChuck. Transform that city into a sprawling ghost-pirate city that terrorize the seas (possibly being at peace with Lanun
). Make that city a minor Civ that never build a new city, just let it be a local terror. Balance would be about letting these things happen with time and not right away. Maybe the Clan of Embers could manage to bribe the Lizardmen tribe to assault the ghost-pirates...Also, with these features slowly populating the parts unexplored by the regular civs, colonization will be way harder later on.
The new goblin clan is awesome, more like that please. I would like to see localized tribes for different areas like Lizardmen tribe for jungle, more Hill Giants (!) - make a tribe of them. Corrupt Dark Dwarves sitting on an artifact (The Drilling Machine) that can attach to a gem/gold mine to increase output with some risk of spawning a Balor for instance. Have the Leviathan build a nest and spawn his offspring making those waters terrifying to just approach.
The new lair system is excellent, add more unique lairs and unique items/heroes/events for them. I would like to see it having more options and different consequences.
Events, events, events. Allways fun. Also, more chain-events and quests would be nice.
Lastly, the AI. I know it's being worked on but one of the things that's the most urgent in my eyes, is the AI:s complete inability of intercontinental warfare.

Maybe it's just my setting/playstyle but I want every new city I build to be a challenge to achieve. I absolutely loved the kind of power Barbatos could extort over my progress but I can see as he how him being unique combined with his power making him unbalanced. However I would love to see minor civs acting as tribes being in the way of all civs. Make them at peace with the Barbarians, unique and slightly more organized than the random barbarians. There is an FFH-adaptation of Jdogs Revolutions being made currently, the BarbarianCiv module would be awesome for creating this. Have a Barbarian city build a wonder that spawns the Sailors Dirge and LeChuck. Transform that city into a sprawling ghost-pirate city that terrorize the seas (possibly being at peace with Lanun

The new goblin clan is awesome, more like that please. I would like to see localized tribes for different areas like Lizardmen tribe for jungle, more Hill Giants (!) - make a tribe of them. Corrupt Dark Dwarves sitting on an artifact (The Drilling Machine) that can attach to a gem/gold mine to increase output with some risk of spawning a Balor for instance. Have the Leviathan build a nest and spawn his offspring making those waters terrifying to just approach.
The new lair system is excellent, add more unique lairs and unique items/heroes/events for them. I would like to see it having more options and different consequences.
Events, events, events. Allways fun. Also, more chain-events and quests would be nice.
Lastly, the AI. I know it's being worked on but one of the things that's the most urgent in my eyes, is the AI:s complete inability of intercontinental warfare.