1.) To Adjust The Approval Emails (Although this goes for all emails)
You need to edit line 5125 in the includes\helper-functions.php
You could likely put in some additional logic by referencing the form id, if you wanted them different for each form.
For me I change this:
$approver_notify_content = "This entry needs your approval.<br/><br/>Please approve or deny by using the link below:<br/><strong>{$view_entry_link}</strong><br/><br/><hr style=\"width: 60%;margin-top: 20px;margin-bottom: 20px\"><br/>{entry_data}";
To this:
$approver_notify_content = "This entry needs your approval.<br/><br/>Please approve or deny by using the link below:<br/></br><strong>{$view_entry_link}</strong><br/><br/>";
Which removed the entry data as I didn't want that sent in the email.
2.) In order to adjust the logic email, you have to modify the Notification email. Then disable it.
3.) Still Don't Know...