altering shortcuts in a GtkFileChooser widget?

["Michael L. Gualtieri" <mikeg cs pitt edu>]

I'm writing an app that uses a GtkFileChooser widget and I'm curious about two things that I can't find much information about.

1. 
Is it possible to alter the default 'shortcuts' displayed on the side
(in the 'Places' portion of the window)?  I know I can add to these,
but I would like to rename and/or relabel the defaults.  On my system
the defaults are my username, 'Desktop', and 'File System'.

2.  Is it possible to remove this shortcut portion of the
widget or is it possible to just call the portion of the widget that
displays the filenames?

Thanks for your help!