Rans6, with regards to Q3:
You can get four if you click rapidly enough. I thought you said you were a demon clicker
Slightly more sensibly, once you have a file viewer window open right click on the "Home" icon on the left & click "Open in New Window".
You can also press F3 to give a split window view - panes you can independently change directories in. More useful IMHO.
Not sure about the others - I'm not a regular Ubuntu user & really don't like Unity
