How do I create and deploy a custom DesignerType to be used in a Sharepoint Designer workflow action?

Question

I would like to create my own DesignerType for my custom workflow action that will be consumed by Sharepoint Designer. Is this possible?

Answer 1

Are you asking about a designer "Custom Action"? check out this article on MSDN, http://msdn.microsoft.com/en-us/library/bb629922.aspx

Or can you further describe what you mean by "DesignerType"?
-Jonathan

Answer 2

I have already created a bunch of custom actions. I'm asking about adding to the default set of DesignerTypes outlined here:

This one may be out of even Skeet's reach.