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pg111 - does it work?
I use this feature a lot so I set a couple of unimaginative short cuts:
In the Book List I make the source book current and press Ctrl+C, then move to the target book (usually top of list because I just added it) and press Ctrl+V. Saves me lots of time.
The 'u's are injected into all 'string' tweaks, started a while back (version 4 maybe), might be something to do with unicode. AFAIK they're harmless, here's my exclude list
exclude_fields_on_paste = [u'authors',
u'author_sort',
u'title',
u'title_sort',
u'pubdate',
u'timestamp',
u'cover',
u'#setting']
Added: I moved your thread to here, the Editor subforum is all about the Book Editor, metadata editing is regarded as a Library Management function.
BR