domain mapping site_url & home value

Hey guys,
I've got a quick question about your domain mapping plugin,
Does the plugin update the site url? I know donncha's did not, and this caused problems with some other plugins not functioning/loading once the mapping was set up.

basicly, does yours update the site_url values and the home values in wp_options?

this guy is talking about his hack for donnchas plugin here, it may help to understand what im talking about..
http://forums.lesterchan.net/index.php/topic,4230.msg28581.html#msg28581