Not sure if it is relevant, but I went back to a snapshot before adding the SSD pools, and everything is fine. (Except I couldn't restore with SMVI, because the vSIM discs are IDE's).
So it appears that as long as you don't try to use FlashPools, it may be okay. FlashPools won't buy anything on the simulator, but it would have been nice to test it.
BTW, I found one more issue with the vSIM cluster. If you lose node 01, node 02 will not take over the cluster management port, it appears it develops in to a split brain. Same thing happens if you boot both nodes simultaneously. My solution is to bring up node 01 first, then node 02.