A few weeks back, I set up a bbpress forum just to have a look. Today, I see that several spammer accounts have been created on that forum, having already created several topics and posts.
Beyond the trouble of getting bbpress spammed, I'm concerned that those new accounts automatically got some priviledges on other services installed on ladistribution (e.g. a dokuwiki).
So I think it is important that the registration form in bbpress could be disabled. And I suggest to make this the default setting when installing a bbpress in ladistribution.