Is it possible to change the redirect URL during a gradual migration from
WSS 2.0 to WSS 3.0 without killing the migration/web app and starting
everything over again?

I see in the SiteMap table in the WSS 3 config database, there is a column
named [RedirectURL], but am unsure if changing this value will do anything
(or is a supported thing to do).

Any thoughts? Anybody?