It's possible place (or repeat) a button bar in all or several layouts and if it's updated you don't need re-copy it and paste it back into all the layouts.
That is, something like a hyperlink o virtual button bar.
Sorry for my bad english
I believe that there's a product idea asking for this over in the product idea section. You might want to go over there and vote for it.
Closest that you might come to this would be to put the button bar in a floating document window just large enough to hold the button bar that then floats in front of your windows as a kind of "tool palette"--but I see major complications in that idea in terms of correctly identifying "context" each time you click a button in that floating window.
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