Please add option of "type of liquid" (liquid type: water or lava).
This option was in older versions but for some reason it was removed.
I know you can replace "WATER" with "LAVA" in your code, but some users don't know that.
You can already set the density and add the event to hurt the player like lava, but only in code (custom code) to make entity burn.And your fluid will be sounds like water(if you do not change the type of liquid in the code)! It is very important option. Please add this option.