1. Crafting combinations
I personally have not touched the crafting combinations at all, so I'm not the person who should be explaining how to manipulate or create new ones.
2. Item/Character scripting
I have only briefly touched upon this topic in my other thread. I know how to make a script and attach it to a RootTemplate, but there is still so much that needs to be learned as to what we can really do with it.
3. Globals editing
I have only recently discovered that this was possible (changing a level-specific character in the main campaign). The Mods/(Mod name)/Globals/ is the other place that the items/characters created from the RootTemplates are stored, and to me is a place for research to take place.