local separator = widget({ type = "textbox", name = "separator" })
separator.text = " <span foreground='red'>.</span> "
You can also customize the menu by using any of the following settings in your theme file:
theme.menu_fg_focus
theme.menu_bg_focus
theme.menu_fg_normal
theme.menu_bg_normal
theme.menu_submenu_icon
theme.menu_height
theme.menu_width
theme.menu_border_color
theme.menu_border_width
The names are pretty self-explaining, theme.menu_submenu_icon is used to point out the icon that
will be shown on the items that points to a sub-menu.
Don't know if this is what you where looking for but this gives you some possibilities to
"separate" the menu items from each other.