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Is it particular to the third thing you are dragging? There's probably something unusual about the shortcut that means it can't be turned into a toolbar button, if other things can be dragged. Unless you tried to drag without being in Customize mode first.
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Answered by you above.
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Opus has the same new tab button at the end of the tab strip, unless you have turned off the button or tab strip. Ctrl+T also opens a new tab by default, and you can open new tabs in numerous other ways (e.g. alt or ctrl while double-clicking folders). If you need help opening tabs in a specifc way, let us know what you want.
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Please Ask one question per thread and it's best to describe what you want rather than mention another program, as we don't always know how the other programs work in detail.