Missing Pieces:
* Cannot edit or delete a Strand
* Cannot delete a Plot (Action)
* When editing a Plot (Action), the OK button saves the thing but does not close the window. Works properly when creating a new one, though.
* Relationship editor is too tall for my screen when the metadata is visible. Hiding the metadata works, but other editing windows don't have this problem - they change the size of the big text box, rather than the size of the form - and also this form is one where the metadata is more important than the text box.
Enhancement requests:
* Several versions ago it was legal to have chapters & scenes with identical names. Can this be made legal again? It's not at all uncommon, particularly in stories with multiple first-person narrators.
* Items and Locations have a Relationship tab listing all the relationships, with checkmarks next to the ones which apply to that thing. I would prefer that it have only those that the object is involved with. This would require a way to add an existing relationship, as well as the (already provided) way to create a new one.
* It would also be nice if Characters had a Relationship tab.
* Can there be a way to edit the Styles available in text blocks?
* When things are being automatically numbered, I'd prefer an increment of 10 or even 100, rather than 1. This makes it easier to add scenes (or chapters or parts) in between existing scenes, or before the first scene.
* When things are being manually numbered, the user has to remove the plus sign. The program should be able to just ignore it.
* On the Scene form, it would be nice to have two sets of Next and Previous buttons; one set would be normal, the other would skip over scenes with the Exclude flag set.

Missing Pieces:
* Cannot edit or delete a Strand -> not confirmed
* Cannot delete a Plot (Action) -> solved
* When editing a Plot (Action), the OK button saves the thing but does not close the window. Works properly when creating a new one, though. -> solved
* Relationship editor is too tall for my screen when the metadata is visible. Hiding the metadata works, but other editing windows don't have this problem - they change the size of the big text box, rather than the size of the form - and also this form is one where the metadata is more important than the text box. -> modification to be validated

Enhancement requests:
* Several versions ago it was legal to have chapters & scenes with identical names. Can this be made legal again? It's not at all uncommon, particularly in stories with multiple first-person narrators.
answer: Since the migration to XML, the name of an element has become an identifier in the same way as a digital identity. It is therefore not possible for two elements of the same type to have the same name.
* Items and Locations have a Relationship tab listing all the relationships, with checkmarks next to the ones which apply to that thing. I would prefer that it have only those that the object is involved with. This would require a way to add an existing relationship, as well as the (already provided) way to create a new one.
answer: I will look into implementing this aspect. I had this idea some time ago, but I hadn't put it into practice.
* It would also be nice if Characters had a Relationship tab.
answer: I will look into that.
* Can there be a way to edit the Styles available in text blocks?
answer: More than what already exists? What exactly?
* When things are being automatically numbered, I'd prefer an increment of 10 or even 100, rather than 1. This makes it easier to add scenes (or chapters or parts) in between existing scenes, or before the first scene.
answer: I'll implement that, but it will only apply to scenes.
* When things are being manually numbered, the user has to remove the plus sign. The program should be able to just ignore it.
answer: Just double-click on the plus sign, or press Tab to go to the field.
* On the Scene form, it would be nice to have two sets of Next and Previous buttons; one set would be normal, the other would skip over scenes with the Exclude flag set.
answer: That's not possible; navigation applies to all scenes without exception.

I have uploaded the development version.