There is no SDK/API access to the tool bars in Acrobat or Reader X.
Any plugin or script which used to create toolbar buttons will now create a new panel at the bottom of the Tools pane. Users can choose to drag and drop individual buttons from that panel into their Quick Tools area, but you cannot do it for them.
Very helpfull, I can now see how that works in the sence that I can get tools to appear using View > Show/Hide >Toolbar Items and then ticking the ones I want.
But my tools are in a "folder" called Plug-In File which appears on the right hand side of the page when you click "Tools" or go View > Tools. I can't drag and drop them - help?