The throttle is right in each user’s profile page.
It’s based on username.
If you want to tinker with increasing it, try this plugin I whipped up to avoid core hacks:
function post_regulation($text) {
global $bb_current_user;
$wait=45; // seconds between posts
if (isset($bb_current_user->data->last_posted) && time() < ($bb_current_user->data->last_posted + $wait) && !bb_current_user_can('throttle'))
bb_die(__('Slow down; you are posting too often.'));
if (strlen(trim($text))<10)
bb_die(__('Your post is too short, please say something meaningful!'));
if (strlen($text)>2500)
bb_die(__('Your post is too long!'));
return $text;
}
add_filter('pre_post', 'post_regulation');
In theory it would be possible to hack that further to regulate based on IP by doing a mysql query for the last post time that has the current user’s IP.