Disable team PvP. No one likes to hit people on accident in the heat of battle.
Offensive splash potions only affect players on other teams(instant damage, slowness etc.). And the other way around for defensive potions(healing, regeneration etc.).
Cool down on splash potions.
Infinite armor and weapon durability. Never have your sword break in a battle again.
Configurable infinite items.
Disallow player item drops.
Location reset.
Splash potion cooldown is triggered when right clicking a button or a lever.
The player can not right click a button or lever with a splash potion if it is on cooldown.
Potions with the same effect may have different damage values. (minecraft bug, more info)