I am not some kind of an expect at this but, since the link currently says shinobilegends.com/referral.php?r=Enter Name Here...then the system would recognize it as a referral.
So for this change to occur, Neji would probably need to modify things around, but I don't know if that is hard to do.
I don't think it's very hard to write down the link, give it to your friends, your friends type it in the url and play.
Seems simple to me. It is their fault that they lost it, forgot it, misplaced it, or even if they typed it in correctly.
This is supposed to be a feature request, right?