We can add additional iSCSI target without breaking cluster – and this is good!
http://vimeo.com/moogaloop.swf?clip_id=57406962

So without breaking working Cluster we can add (or remove un-clustered) new:
Volume Groups
Logical Volumes
Targets
Replication Tasks
But we can't set the iSCSI parammeters on the new targets (!?!), even they are not in replication task. The default DSS iSCSI parameters of new-created targets are much different as VMWare and Win recomended parameters, so working with them is not optimal.

I find one sollution (but shouldn't be an example of good practice):
If we allready have an optimized target on both nodes and they are not in the Cluster, we can add additional logical volume to them as LUN 1, 2,…
It works for me, but does anybody see any problem with multiple volumes on the same target?

Best regards!
Toni