Custom login page

Is it possible to use a custom login page to login to the sitecake cms

Not with the current version. Though we can consider adding this option to white label or subscription based option.

@predragleka How hard it would be to add it to the white label version?

Hi,

you could send GET request to yoursite.com/sitecake//src/app.php?service=_session&action=login&credentials=<sha1(password)>. In most cases that should do the trick.
You should call URL as JSON AJAX from your client. Possible responses are:
{status: 0} - Successful login
{status: 1} - Authentication failed
{status: 2} - Another user is already logged in into sitecake (only one user at the time can be logged in)