I Think, actually is not possible select a quorum disk when a clusterware 11.2 or 12c is being installed.
The procedure is defined that prepare the cluster without the quorum and then add the quorum with ASMCA or commands.
I think, Allow to add quorum from the initial OUI will be great.
the wizard can be reviewed on this oracle official PDF: Pages 13/35 , https://www.oracle.com/technetwork/database/availability/maa-extclusters-installguide-3748227.pdf
Thanks and regards.