Yesterday I faced a very annoying thing - when I equipped my dual-wielding rogue with a unique flail from the first town, he started to strike without any delay. I had to sell this item, but when I gave him an unique stiletto this thing occurred again.
So, now my rogue is in fact unplayable because I cannot give him the preferred weapon. Technically it looks like there is just no delay bar and the character is constantly hitting with both hands like crazy.