We did not analyze the failures when an error occurred with the temporary .nfsXXXXXXXXXX files, but it happened from time to time. The solution was to switch to Samba
So the baseline of what you are saying is: "No, there is no easy way to provision a shared virtual disk in read-write mode to multiple VMs."
But is it possible that such a feature will be added in the future or do we need to further pursue performance improvements inside the VM by using Samba 4.1 for example.
Thanks,
Michael