That's crazy talk, why do you want to do this? You may notice this :
[ ] Email All Posts For This Forum
Next to the submit button, people who click on that will receive all posts that go through the particular forum (not just the thread). Other then that, you're thankfully out of luck.
To send questions to large groups like that, consider the php-general mailing list, info can be found here :
http://php.net/support.php
