Register User as Both `Subscriber` & `Participant` - wordpress

Question

I am currently working on a wordpress website. It is both a blog and a forum.
bbPress Documentation says it has 5 roles:
Keymaster – Can create, edit and delete other users’ forums, topics
and replies. Can manage Tags, and moderate a forum with the moderation
tools. Has access to global forum settings, tools, and importer.
Moderator – Can create and edit forums. Can create, edit and delete
other users’ topics and replies. Can manage Tags, and moderate a forum
with the moderation tools.
Participant – Can create and edit their own
topics and replies.
Spectator – Can only read topics and replies.
Blocked – All capabilities are explicitly blocked.
Wordpress by default has 6 roles.
Super Admin – somebody with access to the site network administration
features and all other features. See the Create a Network article.
Administrator (slug: ‘administrator’) – somebody who has access to all
the administration features within a single site.
Editor (slug: ‘editor’) – somebody who can publish and manage posts including the
posts of other users.
Author (slug: ‘author’) – somebody who can
publish and manage their own posts.
Contributor (slug: ‘contributor’) – somebody who can write and manage their own posts but cannot publish them.
Subscriber (slug: ‘subscriber’) – somebody who can only manage their profile.
In wp-admin/options-general.php page it says:
New User Default Role Subscriber.
In wp-admin/options-general.php?page=bbpress it says:
Automatically give registered visitors the Participant forum role.
I am assuming that if I signup using wp-login.php?action=register then I am signing up as Subscriber
I am also assuming that if I signup using a page that use [bbp-register] shortcode then I am signing up as Participant.
This seems inconsistent to me.
Is there any way, when a user registers, he will be both a Subscriber and a Participant.

Answer 1

You need to hook action on user_register to add second role automatically:
add_action('user_register', 'user_register_participant', 10, 1);
function user_register_participant($user_id)
{
$u = get_user_by('ID', $user_id);
$u->add_role('participant');
}
Put that code in the end of functions.php file of your theme, and this should do the trick.
UPD: use wp-login.php?action=register for registering users henceforth.