MG3 built-in registration doesn't allow copy/paste

I just tried out the built-in registration function of MG3 and I had no trouble receiving the registration code via the expiring link email - that works well.

I was disappointed that the modal window in MG3 which accepts the code did not allow me to paste it in though (I verified that the code was indeed copied to my clipboard).

If this is something that is easy to change it would be welcome. Thanks