Is there some way of adding a modifier to Proficiency Bonus, similar to AC? I know how to add a MOD "Ac +1" or "Saving Throws +1" to custom items. Also, I can see that there is a "pb" attribute in the Attributes and Abilities list, and modifying that, the final Proficiency Bonus in the character sheet changes. However, trying item mods such as "Pb +1" or "pb +1" do not seem to work. Should they, what might be the correct keyword, or is there a way to achieve the update automatically, based on the item rather than setting the final value manually? Or is there a reason why this works for commonly modified attributes, but not proficiency bonus?