You know... I know, creepers are indeed Minecraft's trademark
But they're kind of annoying too
AND FOR THAT REASON, I'VE LEARNED A LITTLE BIT OF MODDING AND I'M PRESENTING YOU MY VERY FIRST ONE:
It is a new gamerule
You'll have to /gamerule docreeperspawn false in order to it start working
Also... i know gunpowder is still important so i added a recipe to it
Charcoal (since the real gunpowder is actually made out of charcoal) + Flint (cause it fits)