for the remember me option:
create a checkbox named Remember Me, set the checked value to 1
Add a Set Cookie Value behavior (WebAssist -> Cookies -> Set Cookie with PHP)
For the trigger, click the lightning bolt icon and select the Remember me checkbox.
set the name to Remember
for the value click the lightning bolt icon and select the remember me checkbox.
Repeat those steps again, same trigger, but this time set the name to username and select the username form element
repeat again, same trigger, name = password, for the value select the password form element
now the the cookies are set, use them as the initial value of the form elements.
select the username text box, in the property inspector click the lightning bolt next to initial value, and select the username cookie
repeat for the password filed, using the password cookie.
for the username checkbox, click the dynamic button, and click the lightning bolt icon next to check if, select the remember cookie binding
set "Equal To" to 1
for auto login, create an auto login checkbox, set value to 1,
create a auto login cookie the same way the remember me cookie is set.
add an additional Security Assist Authenticate user behavior, it will be set up exactly the same as the original one, except for the trigger, click the lightning bolt icon and select the auto login cookie.
on the database tab, set the username and password columns to use the user and password cookie variables.