The tweak doubleclick_on_library_view might also be of interest, if you don't mind a few extra keystrokes:
Quote:
ID: doubleclick_on_library_view
You can control the behavior of double clicks and pressing enter on the books list. Choices: open_viewer, do_nothing, edit_cell, edit_metadata. Selecting anything other than open_viewer has the side effect of disabling editing a field using a single click. Default: open_viewer. Example: doubleclick_on_library_view = 'do_nothing' You can also control whether the book list scrolls horizontal per column or per pixel. Default is per column.
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