Hi Chris,
First, how do I get that pretty numbered line code in my post? 
I'm having trouble getting your code to work
I added this line at the top
var myVcVirtualMachine = System.getModule("org.mycompany.actions").getVmIdByName(in1);
my getVmIdByName (modified to work with your code) is basically just
return System.getModule("com.vmware.library.vc.vm").getAllVMsMatchingRegexp(vmname);
when I run it, i get he following error:
TypeError: Cannot read property "parent" from undefined (Workflow:testing 2 / Scriptable task (item0)#4)
and I can't figure it why.
Below is the Onyx code to remove the custom option
// ------- ReconfigureComputeResource_Task -------
var spec = new VcClusterConfigSpecEx();
spec.vmSwapPlacement = "vmDirectory";
spec.dasConfig = new VcClusterDasConfigInfo();
spec.dasConfig.vmMonitoring = "vmMonitoringDisabled";
spec.dasConfig.defaultVmSettings = new VcClusterDasVmSettings();
spec.dasConfig.defaultVmSettings.restartPriority = "medium";
spec.dasConfig.defaultVmSettings.isolationResponse = "none";
spec.dasConfig.defaultVmSettings.vmToolsMonitoringSettings = new VcClusterVmToolsMonitoringSettings();
spec.dasConfig.defaultVmSettings.vmToolsMonitoringSettings.enabled = true;
spec.dasConfig.defaultVmSettings.vmToolsMonitoringSettings.vmMonitoring = "vmMonitoringDisabled";
spec.dasConfig.defaultVmSettings.vmToolsMonitoringSettings.failureInterval = 30;
spec.dasConfig.defaultVmSettings.vmToolsMonitoringSettings.minUpTime = 120;
spec.dasConfig.defaultVmSettings.vmToolsMonitoringSettings.maxFailures = 3;
spec.dasConfig.defaultVmSettings.vmToolsMonitoringSettings.maxFailureWindow = 3600;
spec.dasConfig.option = System.getModule("com.vmware.onyx").array(VcOptionValue, 1);
spec.dasConfig.option[0] = new VcOptionValue();
spec.dasConfig.option[0].key = "das.ignoreRedundantNetWarning";
spec.dasConfig.option[0].value = true;
spec.drsConfig = new VcClusterDrsConfigInfo();
spec.drsConfig.enabled = true;
spec.drsConfig.defaultVmBehavior = VcDrsBehavior.fullyAutomated;
spec.drsConfig.vmotionRate = 2;
spec.drsVmConfigSpec = System.getModule("com.vmware.onyx").array(VcClusterDrsVmConfigSpec, 1);
spec.drsVmConfigSpec[0] = new VcClusterDrsVmConfigSpec();
spec.drsVmConfigSpec[0].operation = VcArrayUpdateOperation.remove;
spec.drsVmConfigSpec[0].removeKey = vm-1598;
spec.dpmConfig = new VcClusterDpmConfigInfo();
spec.dpmConfig.enabled = false;
spec.dpmConfig.hostPowerActionRate = 3;
managedObject.reconfigureComputeResource_Task(spec, true); // ClusterComputeResource
Good news, bad news.
Bad news is I still can't get the .parent to work and I'm not sure where to look with that /mob url you have me.
The good news is it's working Even the disable part.
To work around the problem of finding the cluster, I used the following code. I use it elsewhere in my deploy workflow so I already have the cluster. I just need to make a small adjustment to get access to the variable (You may have been the one to give me the code below in one of my earlier posts actually)
var vCenters=VcPlugin.allSdkConnections;
//System.log (vCenters[0].name);
for each (vCenter in vCenters){
var clusters = vCenter.getAllClusterComputeResources();
for each (mycluster in clusters)
{
System.log(mycluster.name);
if (mycluster.name=="Cluster02") //check included for future use
cluster=mycluster;
}
}
As for removing the key, I found the answer in this thread:
https://communities.vmware.com/thread/439832
Below is the code which seems to work (I commented out your DRSConfigInfo and it seems to work without that. I just don't want to set any DRS stuff in the workflow and forget about it one day if I reconfigure my cluster options)
var mo = new VcManagedObjectReference();
mo.type="VirtualMachine";
mo.value=myVcVirtualMachine.id;
var myVcClusterComputeResource = cluster; //myVcVirtualMachine as Workflow/Scriptable Task input
var myVcClusterDrsConfigInfo = new VcClusterDrsConfigInfo() ;
//myVcClusterDrsConfigInfo.enabled = true;
//myVcClusterDrsConfigInfo.defaultVmBehavior = VcDrsBehavior.fullyAutomated;
//myVcClusterDrsConfigInfo.vmotionRate = 2;
var myVcClusterDrsVmConfigSpec = new VcClusterDrsVmConfigSpec() ;
myVcClusterDrsVmConfigSpec.operation = VcArrayUpdateOperation.remove;
myVcClusterDrsVmConfigSpec.removeKey = mo;
//myVcClusterDrsVmConfigSpec.removeKey = myVcVirtualMachine.id; //myVcVirtualMachine as Workflow/Scriptable Task input
var myVcClusterDrsVmConfigSpecArray = new Array() ;
myVcClusterDrsVmConfigSpecArray.push( myVcClusterDrsVmConfigSpec );
var myVcClusterConfigSpecEx = new VcClusterConfigSpecEx() ;
myVcClusterConfigSpecEx.drsConfig = myVcClusterDrsConfigInfo;
myVcClusterConfigSpecEx.drsVmConfigSpec = myVcClusterDrsVmConfigSpecArray;
myVcClusterComputeResource.reconfigureComputeResource_Task( myVcClusterConfigSpecEx, true );
Thanks again for all your help Christian. Now to clean everything, integrate it and hope it still works. I will need to run two workflows in parallel to get this to work with my current setup due to using the built-in clone workflow. I'll be sure to post again if I have trouble 
