[imported_Odium]

Q2: If I make 10 items and 2 of them are exceptional, can they be stacked with the others or do they have to go in their own stack?
A2: There are no stackable items that can be crafted as "exeptional"

Q4: Do items with different powers or accuracy stack? Ex: Does a mace of power stack with a mace of vanquishing)?
A4: weapons/armors dont stack

Q5: If I have 10 items and each weighs 1 stone, does a stack of 10 weigh 10 stones or 1 stone?
A5: The stack would have same weight as the amount of items in it in your case the stack would weight 10 stones