So why did you ask about changing songs then if you are saying you already knew how..? Are you saying you want Percy to make his own music just for this game? because the default songs weren't made by him.. just letting you know.
You can change the background too through a similar method. In the textures folder, there is a picture called "bg", just find a new wallpaper and replace it with that. Or are you going to say you already knew that too and you want Percy to just make a new one. Because he didn't make that one either. The projects forum is filled with graphics and bg overhauls if you are interested.
You are right, I misread what you said about the lifepoints, but your english and grammar is very poor at best, so you cant get pissey at me, that as an English speaking person, I could not read your poor English, that onus is on you not me.
I agree that YGOpro needs some changes, but some of your points are just silly and not a major priority at this point. The AI is getting done, but it is just practically only one person right now doing it, in whatever spare time he has, for the billions of card combos that can be done.