Is there an available module that lets you edit, add commentary/notes, and so forth?
Actually that is what e-Sword does. You have the Study Note editor which acts like a wide margin in an actual Wide Margin edition of the Bible, and you have a Topic Note editor which acts like a note page one can insert in a Loose Lead (Wide Margin) edition of the Bible. The beaut thing with the Study note editor, you can sync your notes with the verse that you are making notes on.
Not only that, you can also underline and/or highlight text in the Bible Window.
With that said, I think what you are looking for is to put notes in the Bible Window, of which e-Sword doesn't have that capability. That said, the Study Note editor serves really well for making notes on verses, editing and/or deleting them.
Trust you will find this helpful.