Description of problem:  
Its often useful to modify the properties of multiple files at once 
(eg, change permissions for all the files in a directory). When one 
attempts this, Nautilus pops up a seperate window for each file.  
 
This makes changing the permissions of any large number of files 
quite time consuming. Rather than fill in thirty dialogs for thirty 
files, it'd be easier to have one dialog with the combined properties 
of the file (see how Windows and KDE do this - eg, grey the boxes 
where the permissions aren't consistent).