Note: This is not actually a request but rather sharing an idea. But if someone wants to script these ideas, then by all means...
I thought of a few script ideas and I'm wondering if they've been done before...
Damage Shield: A state that deals damage to an enemy if they attack the character with the damage shield.
Sacrifice: The opposite of drain. Takes some of the caster's HP/SP and transfers it to an ally or all allies.
Think both have been done/can be easy done with current scripts
Damage shield sounds like counter.
Sacrifice can be done with one of the skill effects in Tons of Add-ons. I can't remember which one it was (maybe Revenge).
Damage shield is sort of like counter. Instead of the character actually attacking, the enemy just takes damage when they land an attack on the character with the damage shield. Script-wise, it's probably much the same. I'll take a look at it...