Hi,
There is a setting you could add to user.config:
<add key="IncludeParametersIn301RedirectLookup" value="true"/>
However, my advice is don't add this and use IIS url rewriter instead as Joe D suggested.
If you add this setting it will do a second database lookup for the url with the parameters so it is an extra hit to the db on every request that I would rather avoid myself if I could but it is your own decision. It isn't that expensive but every little bit adds up and I prefer to keep things as light as possible.
Hope that helps,
Joe