Thanks for the update..

Working fine for me, added additional places for COWAA so its on login, register, create and no accounts. added a peek-a-boo instructions, but not getting FontAwesome icons to show, will have to play with that some more.

ZC1.5.5e
COWAA
PHP7.1
FireFox v56.0 on Ubuntu

Cookie does what the browsers settings are. Deletes on logoff, still there on browsers close/reopen. If browser is set to delete cookies on session end, it deletes the remember me cookie too. No added code to prevent non-account users from triggering it.