Make a mel button with thisxform -ws -a -rp 0 0 0 Changes the rotation pivot only, use -sp for the scale pivot. I'm no good at mel or scripting so I can't figure out how to string them together, but it should do what you're looking for.
m4dcow> type both rows in script editor, select/highlight both strings, MMB-drag to shelf, select to save it as "MEL". Voila, shelf-button with what you spoke of.