Option to open rcmail in a new window?

I've been using rcmail for almost two years now, and over time, I've found having a dedicated roundcube window was more comfortable for me.

However, I'd love to keep the single sign-on provided by the rcmail module.

Is there a way to get the module to open a new, roundcube-only window (that is, without the drupal navlinks, columns, theme, etc), while still passing the login/password? I'm not sure the Drupal API supports this, as it would probably require "return"-ing the $content to another window, but I'm no coder ...