Hi Tully,
1. You would need CSS to do that. It will be easy in the next version of GP premium (should be out soon!) which allows users to give a Custom ID to each section.
If you want to hide section now, add the CSS below Simple CSS Metabox for the page (change the second #). Keep in mind that this needs to change if you rearrange the sections
#generate-section-# {
display: none;
}
In the next version you would be able to enter a custom ID and do this instead and it will still work when rearranged.
#customID {
display: none;
}
2. Unfortunately no duplication feature right now. A couple people have already mentioned it so we will add to the suggestion list for sure π