Is this possible or just for all sites? Don't really need users waiting minutes to be logged in to the 100+ domains on my network. However cross domain login for the users own 1-2 mapped domains would be ideal to guarantee compatibility with plugins that rely on a login cookie to view front end. For security reasons I need to force logins and administration to original domain which breaks plugins like under construction by Jeremy Massel that allow visibility of a hidden site when logged in. This of course doesn't work when logging in to subdomain.network.com and trying to view mappeddomain.com.