1) "Go to nauvis"
2) "Go to last visited project stage"
These would allow 'alt-tabbing' between the Editor Extensions surface and the latest stage of an active project. Existing hotkeys like "Go to next project" and "Go to previous project" return to stage 1 or 2. Copying over part of an existing blueprint to convert into stages requires up to 3 clicks to get back to the last stage and 2 for nauvis. Ideally I would bypass all this by copying over the entire finished blueprint and create new stages "At front" while progressively removing parts from the final stage. But I'm guessing that later stage entities updating to earlier stages would be much harder to implement, especially if considering a 2.0/SA update (I'm currently using the mod in 1.1 for an IR3 run).

3) "Create new stage after current"
I don't use "At front" and it creates extra stages that are annoying to get rid of (delete stage 1, merge with stage 0, and rename stage 0 to stage 1 since the original stage 1 couldn't be deleted and stage 1 being named stage 0 in the blueprint book would be confusing) and seem to mess with stage order (go to next project now jumps to stage 2 of this project instead of stage 1), but it's very easy to misclick.

4) "Go to first stage of current project"
5) "Go to last stage of current project"
Sometimes I do want to jump to the first stage to make projectwide changes. For example, I like to mark the borders of the final stage with bricks and overlay those on every stage to avoid building over future stages in the real map. I also often jump back to the last stage to continue expanding the blueprint after fixing earlier stages.

6) "Get blueprint book"
I don't change settings for every project and want to simply dump the book to inventory (actually to library but I understand that's impossible).
These hotkeys would eliminate my need for most GUIs. I avoid buttons for anything repetitive like proposed hotkeys #1-3 and usually hide the buttons in the top left corner with a mod setting or GUI Unifyer/GUI Manager.