[plt-scheme] mred - cut/copy/paste keybindings in text%

Hi.
Whenever I create a text% object, there doesn't seem to be any default
keymapping to cut/copy/paste functions. I end up having to retrieve its
keymap and mapping/adding these functions myself. Should this behavior
not work "out of the box"? Should I be doing some chaining to some
default keymap?

Thanks,
-- 
Ittai