Automatic OAuth redirect once an application is authorized

It'd be great if the OAuth redirect happened automatically for applications that have already be allowed. This would let web-based apps use Twitter as their login method.

This would work by first getting their access token, and then using the API to run verify_credentials to find out who they are. Once a user has authorized a site, they can log into that site very easily: click a button on the site, be taken to Twitter's OAuth page, and then redirected straight back to the site.

Currently, Twitter asks the user to accept or reject the request every time this happens. It's really close to working already.

Is there another way of achieving a one-click login/register process?