Custom profile fields can currently be displayed in viewtopic, viewpm and on the user profile. However to display the field on the memberlist we require that users edit all of the templates they use to display it manually. Further there you cannot search in the memberlist by custom profile field.
To make custom profile fields as powerful as regular profile fields, and to lessen the burden on users for effectively using them we should add an option to display the field on memberlist and to allow filtering users by values of the custom profile field.
I have create a separate ticket for each of these, but consider them to be strongly related, so only one RFC.
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Ticket (Memberlist): http://tracker.phpbb.com/browse/PHPBB3-10923
Ticket (Search): http://tracker.phpbb.com/browse/PHPBB3-10924



