I know Silverlight 4 can handle elevated permissions outside the browser. Is there a way to accomplish this inside the browser?

I need to make a folder/file upload manager that gives a better user experience than the standard , and I'd like to implement it in Silverlight.

I know Java has an option to gain elevated permissions, but you have to attach a signed certificate to your app. Does Silverlight 4 have a similar option - to gain elevated permissions by attaching a signed certificate (after warning the user, of course)?

-Doug