So I made my own custom engine with all the best available Features I can have, but I can still use money on them when making the game (Even after selecting my own engine) do I need to do that, or is that a waste of money?
Building your engine only makes the features in it available for selection when making a game. To use them you need to select them in the proper stage development menus.
Ah, alright. Thanks for clearing that up for me! 