OMG, Okay, do not make it free... But it can be added as an achievement reward Just let every player have death sound effects, since audio do not cause lags... I'd rather buy an additional enderchest slot than sound effects.
This will be added but it will be cheaper since it's for fun only not really something worth allot ^^
That's actually really useless, when then 5 euros for all those. I would better get kits than making some little changes into my gameplay