I'm a great fan of Legend of Grimrock and the development of LoG2 is my chance to share my ideas with you developers!

1) Try to add more altered statuses like in other rpg Series like Ultima and Final fantasy
(change the names of course, if you want to avoid jail

Poison
Sickness
Clumsy (dexterity down)
Weak (strenght down)
Stunned (cant act for some time)
Hunger (doubles food consumption)
Blindness (chance of attack with weapons very low)
Mutism (cant cast spells)
Caos (randomly attack friends)
Curse (stats going down)
Reflex (partial magic reflection against enemy)
2) Bleeding: sometimes a wound starts to bleed. ...Hurry!, cut an old cloth in rags with your dagger and stop the blood!!!
3) Righty - Lefty Characters. There is an arm stronger than another. Use that for that heavy mace!
4) Localized Wounds. If you're hit in the arm, you cant use it for a couple of seconds; if you're hit in the leg, the party starts to walk slower...