I was thinking that a Show/Hide button for the editing menu would help, especially when screen resulutions are not too high.
I was trying to use it in my netbook that has a 1028 X 720 (or something around that), and the editor takes almost one third of my screen.
This option would help make the editing process more clean, so that people onle open the menu when necesary and can move things around more easily.
I was looking at a competing software (only for upfront) at http://www.pagelines.com/shop/club/dms/
They have the editor in the bottom. Maybe you can take a look at it.
What do you think?