I was going to put this in the planned features thread, but I felt it deserved its own post. Would people like to have a human-readable graphic user interface for this engine, similar to what you would find in RPG Maker programs? As an example, instead of having to write your own JavaScript code, you could construct an action/item/other object by filling out text fields or checkboxes for every attribute, and the program would automatically translate it into the correct JS code block.
If there's interest in this, please direct me towards resources for how this could be made, because it's currently a bit above my experience level.