Re the toolbar button - well you have both keyboard shorctus and menu options as additional way to move to the next group, so hopefully that should be enough. Maybe one day Kovid will offer a way of creating plugin widgets to the main GUI (a few people have raised things in the past like wanting a status panel etc). A little panel able to be displayed on the book details pane or something which could have next/previous group buttons, a count of duplicates etc would offer another way to navigate all this stuff. Not likely to happen any time soon if at all though.
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