I just wish there was a -v during build and that -v supported any arbitrary mount like fstab. It would be nice if -v mapped directly to the mount namespace so could do things like:

iscsi:/data /data nfs://10.0.0.1:/data /data smb://10.0.0.1:/data /data ebs://10.0.0.1:/data /data

How much cooler would that be :-)