Hi Wil,
Your requests sound quite specialised for book making but some comments:
1. The ability to provide binding margins for images for a photo book -- different for each job.
You can already set page margins to whatever you like - accessible from the "menu cheater" button. Or are "binding margins" something different?
3. An improvement in the text functions to be as good as Photoshop so I won’t have to go to Photoshop for this issue.
I think you need to spell out in detail what you mean here.
4. Watermark feature to provide a copyright that positions correctly for either landscape and portrait.
You can do watermarks already using cutouts. How accurate they are depends on how well you design your cutout. You may need separate ones for landscape & portrait, something I do when making a new cutout or frame for QU.
You most likely won’t believe me, but Qimage offers no advantage in print quality from Lightroom.
I don't unless Adobe have stolen Mike's ideas and algorithms.
but I don't own a copy of LR to confirm that
Terry