[plt-scheme] Key bindings

Hello, I'm new to the list.
I'm using Dr Scheme to do some programing, and want to assign some  
keybindings for my spanish keyboard. That is, I want to associate the  
key " º " to the insert-()-pair function, so I do:

(module javi
   (lib "keybinding-lang.ss" "framework")

   (require (lib "tool-lib.ss" "drscheme"))

   (keybinding "º"
               (lambda (editor event)
                 (send
                  (send editor get_keymap)
                  call-function
                  "insert-()-pair"
                  editor event #t))))


But I got two errors: numer one saying that "º" is not a valid  
keybinding, and second something related with "insert-()-pair", which  
I think is not a valid funcion inside Dr Scheme itself.

Can anyone help me with this?
Is it planned for Dr Scheme to let the user configure graphically the  
keybindings in the future?

Thank you.