Tinkers Addons Mod is a very straight forward mod with little needed documentation.
It adds (as of now) 4 new modifiers to Tinkers Construct 2.0:
Auto-Repair (levelable like the old version; caps at Auto-Repair V)
Bonus Modifiers (level I, II and III), they work the same as the old bonus modifiers
Because of the nature of the new Tool Forge / Tool Station, I had to add new items to make working recipes for the bonus modifiers.
This is why there are now “Bonus Modifier” items added, as well as a moss ball. The bonus modifiers use (mostly) the same resources that the original Tinkers tool station recipe did – but it’s a normal crafting recipe that you then apply to the tool after crafting it.