[plt-scheme] question on extending DrScheme

Hi all,

I've created a custom keybindings module, but it appears I need to  
restart DrScheme each time I change that module.  Is that right?  If  
so, is it possible to run code in the interactions window (or with  
the 'Run' button), something like this:

(require ___)

(let ((editor ___))
   (send editor insert (make-object string-snip% "test")))

So that I can experiment and learn the drscheme/mred API without  
restarting?

My goal is to create something like Emacs's `dabbrev-expand' ...  
don't know if that will be possible or not.

thanks,
Rob