Just a thought here but can you add a login box/link on the maintenance page? It took me awhile to remember the correct url updated by @dazed: 03/16/17 01:22:42PM
Thanks Nate. Obviously only admin's can login in Maint Mode but there should just be a link to the login page should we want other Admins to login. Simple add but saves us time from trying to find a link.
Send it to support if you can - I'm on my wife's laptop so will not be able to look at it tonight, but hopefully someone else is online and can check it out.