That option is not here… I’m aware that on other forum sites this feature is probably present only to allow mass PM-ing your friends. This is not needed here because there is no limit on number of PM recipients once you are regular member. You can even use PMs to create private topic and add multiple members to discuss something between friends. In future we would like to allow creating groups of users so that they can have their own sub-category in the forum to discuss multiple topics.
Can you think of any other use for friends list?