First: I really love this add on!
But...I needed a way to automatically set the registered user's display_name to firstname + lastname and came up with the (not so friendly) solution to edit userregistration.php a little bit.
The way I did it was by adding
$config["meta"]["display_name"] = RGForms::post("gf_user_registration_display_name");
after line 485, and
{ 'name': 'Display name', 'value': 'display_name' }
after line 696.
Now, in the User Registration Forms settings, I have the option to set 'Display name' to the 'Name (Full)' field of my registration form.
I guess the way to do this the right way, is through a custom function, but need some directions on how to. Hope someone can provide an example..
Thanks in advance!