Width of entire top level menu
I think what he means is can you set the entire width of a top level menu to fit a template
ie you have a web template at 750pixels wide you want your top level menu to be 750pix wide by say 30pix deep and each individual menu item work out automatically what it needs to be to fit within the 750 pix.
"sitexpert menu maker" has this facility and i cant see it within css menu writer. Would be a neat addition.