Support for ESX server in Kiwi CatTools (VMware )

Yes, this is certainly on our roadmap although we'll likely be more focused on config mgmt for the Cisco v1000 (http://www.cisco.com/en/US/products/ps9902/index.html).  

Having said that, you might be able to accomplish this today if you're comfortable writing a script.   It would require the installation of the VMware Infrastructure Remote CLI on your CatTools machine (http://www.vmware.com/download/vi/drivers_tools.html).  Then, you could use the existing "Device.CLI.Send Commands" activity to execute a vbscript that performed the appropriate vswitch config actions.