It'd be nice if the admin password re-enter security got suspended while sending newsletters. When I send out a newsletter I have to check back on it regularly to login in. Gets annoying after a while.
I can imagine that would be very annoying :).
I think the updated mail sending in SMF 2.0 should sort this problem out.
Introducing SMF 2.0 (http://www.simplemachines.org/community/index.php?topic=156980.0)