My deployment workflow has been working great for several months now (thanks to everyone here who helped) but it's time to make a few adjustments.
I'm thinking I might have to rework everything but just wanted to check in case I'm missing something...
Right now I'm using the built-in clone, sysprep with crendentials and 1 nic workflow.
I would like the ability to specify thin/thick provisioning and the ability to use datastore clusters and a vDS instead of a standard one.
I don't quite understand how the network/sysprep stuff works in the workflow I'm using now but from what I can tell, I'll need to duplicate the clone, windows with single nic and credentials workflow then hack it and use the info from this post: https://communities.vmware.com/message/2141906#2141906 to use a datastore cluster.
From looking at the CloneVM action (there's two as I discovered), one seems to accept a thin/thick option so I believe I can use that to try and build my "spec".
From a VDS, I did a quick test and it seems I can select it by name just like I do now using the built-in action as long as I add the (vDS_Switch_Name) after it as that's part of the name it wants to find.
So.... before I rework everything, is there an easier way or am I stuck? 
Thanks