Shock Ability

Yes it's possible but you gotta code a check for enough MP, deduct the MP used from total and consider command disabling if MP below 50 and command enabling when MP goes back higher than 50, as an example following the use of an elixir. I'm not sure you could easily hook up to the existing system since Shock is not a spell and will likely have to redo part of the MP logic for this ability only. (Shock is also a spell but it is not cast here like spells are)