Sovereign stats?

Strength really becomes useless when you can find books that give plus 8 to attack.

Maybe there should limitations on armour and weaps. So to wear light plate you need atleast 4 str per piece of plate with heavy being 6 str per piece but say you are wearing four pieces of heavyplate so you would need 24 str but if you have only 23 str you loose a combat action and with 22 str you loose two to three action points and overland travel slows by one. 

Also with weaps to use a battle axe you need at least 20str and 14 str for a broadsword but say if you have 11 str you can use two arms to wield the broad sword.

Sounds like a good suggestion. I just feel like now it's too easy to sacrifise base stats to take all the good traits at character creation (+2 food, +1 research etc) which makes me more often then not play with a pre-made character just to make it abit more challenging.

But am I right about my description of intelligence, that if you use for example spells from the fire book your intelligence does not matter at all?

Also that charisma only affects prestige of cities you are currently resting in?

Correct.

It also lowers the cost of recruiting heroes a bit.

All in all, the current stats for Sovereigns are imo quite poor, equipment being overpowered and all. I hope they'll rewrite the whole system for FE.

Intelligence effects your heroes ability to cast spells. The sovereign could be a mentally handicapped person and cast the spell of making with 5 intelligence. Ironically he doesn't need to be intelligent just his heroes.

I don't even worry about charisma but it does increase your stationed cities prestige and also the cost of hiring heroes but since my ruler usually gives penalties to cities he is stationed in I don't bother with it.

I find constitution to be your best stat because it helps to make your heroes so tuff. Agility kinda sucks right now but could be used to give an increased percentage of crits as well. You only get 3 points and to put them into dodge is fine but another player can just upgrade his weap much easier and still hit you.

dex also increases acc.  As an experiment try boosting one of your heroes dex, then giving him leather armor and the heavy iron shield.  When you also boost his dodge with a spell he can get very hard to hit.  Still not as useful as a hero in full armor though.

I've mentioned in a previous post that we need more options for our heroes.  Like dual wielding and wizard clothes.  The developers have mentioned they are working on more options for the heroes.

Intelligence does need work.  I would love to see the distance you can teleport linked to int.

Charisma also lowers price of heroes, which can be a foundation of a very sucessfull and powerful economic strategy (with negotiations-tech from the cooperation / diplomacy tech-trees). Together with the bard-background heroes can get very cheap very fast. Just true for the Souvereign...

What about ranged weapons, are their damage improved by strength aswell or is agility the way to go for an archer type?

Strength is the way to go for all things damage... (including things like crushing blow or savage strike.)

This is true for all heroes.

You get 5 points of accuracy just for leveling up, so the gains in dex aren't worthwhile.