***** New update
Hello Michael, this is all implemented now in 2.0.42 which is out. Enjoy, or let me know :-)
See https://github.com/aaFn/Bookmark-search-plus-2/issues/66 (note: multi-selection will come later, it is yet a todo)
aaFn

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***** Update
Hello Michael, yes what you say / propose makes much sense. In particular, multi-selection (with Shift and Ctrl) is already planned, but I didn't do it yet.

Could we continue that discussion on https://github.com/aaFn/Bookmark-search-plus-2/issues/66 ? I opened an issue there for that purpose, called "Allow Cut from Search pane". The one on multi-selection already exists as a ToDo.

That will be more practical to fine tune the elements, and to trace the dicussion in the right order :-)
Thank you, aaFn.

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****** Original message:
Hello Michael, interesting considerations and suggestions. I will have a think about it.

Meanwhile, there is a very simple way to do what you want:
- once you have located the bokmark you want to move, simply right click on it and click on "cut"
- then find the place where you want to move the bookmark, right click on that item, and click on "paste before" or "paste into" (the latter is only possible on a folder, and will move the bookmark at end of it).

That's it, the bookmark will move where you want.

Note that until you click "paste ", or until you right click "cut" or "copy" on another item, the initially cut bokmark is dimmed to signal that it is under a "cut" operation, but it will remain where it is, so there is no danger.

This is the same behavior as in the Native Bookmark sidebar.

Hope this helps, and again thank you for the ideas, aaFn.