I have 2 very good ones:
-1. 2 different lotus potions: 1 for changing ONLY stats and another for changing RECIPES (maybe a 3rd one to change both) it’s a real pain in the ---- to have to re learn all the recipes all the time…
-2. Let players fight underwater or make special weapon to do it. Again its pointless you cant kill a player everytime they jump into the water.