I can't answer about the drop down menus, because I've run across a use for such and haven't explored the possibilities.
The is no extended version on the Mac Platform. There is on PC Side. Bigest thing it contibutes is XML based forms plus other touches.
when you go to adobe.com web site click on Acrobat and at some point there is a chart teling you what features are in each version.
Yes, I found the tool and I've drawn the combo box. So tell me what I need to put in these areas to have drop own percentage fields becuase it's not all that clear to me.