Ah, you're right. I've been using MZ lately and just changing it in the database works fine.
Then yes, you'll need a plugin.
Yanfly has one here:
http://www.yanfly.moe/wiki/Weapon_Unleash_(YEP)
However, it does cost money. Too many people were taking his work for free and reselling it as their own. So his plugins are now behind a paywall. However, you can subscribe to his ******* and unlock all his plugins for just $5! And you get to support an amazing plugin maker who has been making plugins and scripts for the RPG Maker engines for quite some time now. His plugins are very beginner friendly.
However, not everyone has the funds to do so. In that regard you can look at Hime's plugins.
These two can both help you out. Though with a little extra work.
This plugin provides advanced battle command manage functionality that allows you to manage each and every one of your actors' battle commands.You can choose what commands an actor will be able
himeworks.com
https://www.youtube.com/watch?v=K_xDzmmQYi8This plugin allows you to add commands that allow your actors to use skills directly without accessing the skill menu.All of the skill use propertie
himeworks.com
The www and exe is the deployed version. Use the rpg project one until you're ready to deploy. You can probably delete the www/exe folder if you don't have any work saved to it to avoid confusion.