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How do I change the default DKIM selector and/or DKIM full selector?

The DKIM selector and DKIM full selector are defined as application params in the configuration, which means you can override them by adding following params in your apps/common/config/main-custom.php file:

'components' => array(
    ...
),
'params' => array(
    ...
    // add these two below:
    'email.custom.dkim.selector'      => 'mailer',
    'email.custom.dkim.full_selector' => 'mailer._domainkey',
    ...
),

Instead of mailer you can use whatever you wish.