RH 7.0 Final.
Sawfish Workspaces configuration (from Gnome Control Center) is a bit odd.
If you add columns or rows, and click 'try' the changes are applied
These vales can go up and down.
If you add Workspaces, and click try, more workspaces will appear.
when you decrease the number of workspaces, the changes won't kick in.
to log out (or equiv.) to activate changes.
Still happens for me. upstream as http://bugzilla.eazel.com/show_bug.cgi?id=8409
*** Bug 30236 has been marked as a duplicate of this bug. ***