as an owncloud newbie i did a new installation, ldap integration works fine.
Now I have to create external users, this is working, too. When creating users manually, there is no possibility to add additional information like companyname, mailadress, user is requested by XY, and so on.
Is there any app available to blow up user functionality?
In ownCloud directly this is not possible. But you might want to have a look at https://apps.owncloud.com/ to see if any other apps are providing this additional info (however i doubt that such an app exist).