you can't move a disk with snapshots and delete the source (500)

Please file an enhancement request via https://bugzila.proxmox.com

As long as the storage type does not change (e.g. qcow2 to qcow2) it should be possible.
 
Does that include zfs raw as well?
yes. we already have such checks for migration with snapshots. qcow2 to qcow2 (since this is self-contained) and zfs to zfs (since we have special support for zfs send) should work. for the other storage types with snapshot support we haven't implemented carrying along snapshots yet, although it might be possible in theory to do so.
 
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