No problem, ZBrush can confuse all of us, now and again. 
Try this. It will add a new sub-palette at the bottom of the Tool palette. Let me know if you encounter anything odd. I’ll add in saving/loading if it works OK. (Note that using with ZSpheres or parametric primitives will probably not work as expected.)
Update Aug 21 2015: I added buttons to Paste just Position and just Size values, and to set the XYZ positions to zero.
Position-Size03.zip (2.08 KB)
Same plugin but with buttons in the Zplugin palette: Position-Size-Zplugin.zip (2.1 KB)Position-Size03.zip (2.08 KB)Position-Size-Zplugin.zip (2.1 KB)