Scripting for monster AI, special actions, etc

Making a visual editor for all kinds of functionalities doesn't always make sense - it would be much easier, and even would make everything more useful, if e.g. monster AI could be controlled with scripts. You would write them in the editor, they would run on the server. The editor is all javascript so this AI code could be javascript too. The same type of scripts could also be run on quest completion, e.g. to give different rewards depending on some condition, like player level.