i make OVF package from andy release so yes PVSCSI is supported, add SCSI adaptater in Hardware.
you can delete or resize the 20G drive if you don't need it, it's just a drive to start to work with package.
I'm running esxi 5.1. I added a new SCSI disk along with a VMware Paravirtual SCSI controller in my VM. After booting up it gets to a certain point and then begins shutting itself back down. Removing the SCSI drive and controller fixes this. Are you sure PVSCSI is working correctly in this ++ build? Can anyone else test to confirm the same issue?