It would be great if the statistics would show the number of email / newsletter recipients, I mean all users that are subscribed.
This has just to be calculated, in my opinion, when the admin opens the statistics page.
Defined is: define('QA_USER_FLAGS_NO_MAILINGS', 32);
For now, the query to get the count of subscribed users should be:
WHERE BINARY flags != BINARY 32;
However, I am not sure if this is the correct bit flag comparision. Any comment appreciated.