I found realname MOD for phpBB that does what I would like to do in IP. It uses a field 'realname' instead of username. I would like to extend this feature to albums, memberlist, and any where else username is used. Does anything like this already exists in IP?

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MOD Name: Realname
Author: FredSchenk
MOD Description: Adds a realname field in your users' profile.
Realname is used instead of username in most places on your forum.
A realname is required in registration info.
The administrator can allow realname changes.
The user can choose to hide the realname for other users.

h**p://***.phpbb.com/community/viewtopic.php?t=364501

You could trick people and change the register files to say Real Name instead of Desired Username, or you can just put a custom field that says Real Name and make it mandatory, the mod doesn't really need to be adapted.