Well, the main reason I ask is that as-is, we can't really add extra profile details during the actual registration process.
What we can do is maintain an 'extra profile details' table/form. In short ... include a 'username' element in your extra details form/table (call it something like 'userid'), set to record the userid. To display the form, include a menu link on your User menu, set to a Fabrik component link, that sets 'Row id' to -1, and 'Key name' to 'userid' (or whatever you called your userid element).
When accessing via that menu link, Fabrik will automagically load the row 'owned' by the logged in user.
If you are sharing the extra profile table with some other application, remember to set 'fbConf_alter_existing_tables' to No in your Fabrik configuration (either with the Settings tab, or configuration.php, depending on what Fabrik version you are using).
-- hugh
-- hugh