Thank you for your reply. It seems a lot of work to implement this feature. I don't know if I have time to look into it. I will see.
Players have to live with the fact that they can never really have an item with e.g. +3 to Willpower. I don't know if that was possible in a savegame because there, an item has already dropped.
Yes, it is possible. You only need to add 3 willpower boosts:D.