Sharks with Lasers on their heads!

My idea is to add an optional command-line to each Nautilus window, which will be one text line high and would appear between the status bar and the icon view. It would be a normal terminal running the user's shell, with a number of interaction possible between the shell and the command line:

• the current directory of the shell and the nautilus window would be synchronized. The gnome-terminal in Ubuntu breezy at the time of writing has an implementation of current directory detection based on escaped echos at each prompt. Some problems here with the other way of synchronization, as a command to the shell might not be parsed due to the user having typed some text.
• file selection on the icon view would result in the addition of the files to the command line. Again, problems will exist if the user types some text. Also, what happens if the use deselects some files?
• a special command would take a list of files and show them in the iconic view. Such lists of file scan be generated with find or grep.
• a keyboard command would switch the view between the four different states: no command line, 1 line high command line, 50% split between command line and icons, only command line (effectively degenerates into a terminal)