password policies : expiry dates and mail notifications

Hello

We are using OIM 9.2.1.

In the password policies, we have activated and defined several, including this one: Password policy for central password of identities.

In the fields of this policy, we have the field 'Max days valid', which I believe indicates the password validity duration for the policy.

We send users regular notifications to change their password, but we don't have an automated process.

We want to automate this process with notifications using a custom process (we do not want to use the process QER_Person_Send mail DialogUserPassword expired, because we have multiple emails for a person).

So we have implemented a process that detects people whose Person.PasswordLastChange > 90 days, for example.

Questions:

1- About 'Max days valid': what happens if we change the value of this field, for example from 0 to 90 days? Will OIM automatically block all accounts where Person.PasswordLastChange > 90 days?

2-We would like to send an email notification from a script. Is it possible to call an email template from a script?

Thank you