You can also chaing existing recipes, items( properties), blocks
only thing I do diferent for my selfish mod is I put all the xml stuf and icons in 1 map called Randor9's mod only special items and stuf that need unity fille stuf ( that I havent goten to work)
This wil spare time and make it easy for people wanting to yuse multiple mods.( this is about sd2dx tool)