both problems will involve adding some lua code to your crafting script.
the first question will involve modifieng the current item in creation
the other will be to add an item to the inventory after crafting the fist one. this is actually not a really right form, cause you will get the recipe for item A while that crafting recipe will add also item B while that will not be seen in the crafting recipe.
you shouldn't change the structure of your mod because others want it that way!
you should structure it so it's easier for you to maintain your mod. while it could be you find it easier if everything is alphabetical, others (like myself and RoboMat) like to bring structure in it by ordening it by functionality.
still if you take a structure that is being used by other modders, or is more logical for a major part of the modders, your mod is better readable by other modders which can give your mod some more love
