Any way to set custom login URL?

Some plugins for user management support custom login forms and enable the option to redirect wp-login.php to their own login page. However it seems that Under Construction cannot be configured to work with this and when the login page is accessed, Under Construction denies access.

Could you implement an option to set a custom URL for the login page? I know that with the PRO version you can enable access to a given URL, but I’d like an option just for that common specific case (custom login URL) in the free version.