Me, too. 
At minimum, I’m hoping for some interesting discussion that might help me better understand current best practices for using iSCSI block storage with TrueNAS based storage.
Understanding the differnces in behavior with iSCSI between Proxmox and TrueNAS has been hard enough that I’m still not off the ground with it.
I’d love to have a better alternative, which led to my post following up on your mention of storing VM disks using ZFS sparse files over here: Raw Sparse Files vs. zVols .
I’m not sure where that’s going to get me, as I’m pretty sure PVE doesn’t allow using sparse files that way. (OTOH, from watching the developer mailing list, there seems to be a massive storage system overhaul coming in PVE 9…)