Doing some more playing, I find that my custom keyboard shortcuts are set as expected when viewed in gconf-editor ( /apps/metacity/window_keybindings/move_to_workspace_up etc and /apps/metacity/global_keybindings/switch_to_workspace_up etc) but that doesn't make compiz (or whatever) use them. The view in the keyboard shortcuts settings dialog does correspond with what the keys do, and changing the shortcuts there does change them. Not sure if gconf is actually meant to be used or not ...
Doing some more playing, I find that my custom keyboard shortcuts are set as expected when viewed in gconf-editor ( /apps/metacity/ window_ keybindings/ move_to_ workspace_ up etc and /apps/metacity/ global_ keybindings/ switch_ to_workspace_ up etc) but that doesn't make compiz (or whatever) use them. The view in the keyboard shortcuts settings dialog does correspond with what the keys do, and changing the shortcuts there does change them. Not sure if gconf is actually meant to be used or not ...