[plt-scheme] Refreshing servlet dependencies

I've noticed that if a servlet requires some module and then that module is
modified and a "Refresh Servlets" is performed, the changes to the module do
not take effect.  Is there a way to accomplish this short of restarting the
web server?  Is this the desired behavior?  If so, could someone please
explain why?

NB: This has been brought up before:

   http://list.cs.brown.edu/pipermail/plt-scheme/2002-August/000305.html

But this question wasn't addressed (or I'm blind).

Thanks,
David