Prevent the creation of a certain, standard DocType, in Documentum

I am using My Documentum for Desktop, and I had to extend the behaviour of my DocBase - as creating new DocTypes and the related TBOs -. To be precise, I have created a new DocType, called emdd_document; this inherits from the standard type dm_document. Everything works fine and emdd_document, with its TBO, has its own logic, derived from dm_document's one.

However, I want to prevent users from using the standard dm_document, allowing them to use only the derived one (emdd_document), but I have no ideas about the way of doing this. If dm_document was a derived DocType, I could create an empty doSave() function in its TBO, blocking the object's saving action. Something like this:

@Override
protected synchronized void doSave(boolean saveLock, String versionLabel, Object[] extendedArgs) throws DfException {
    DfLogger.debug(this, "This document type cannot be created!", null, null);
    //super.doSave() is not called
}

But, being that a standard type, I cannot follow this approach.

So, I am asking: Is there a way to prevent the doSave() excecution for a standard type? Or, strictly speaking about My Documentum for Desktop, is there some configuration that prevent users to choose that DocType, during a document's creation (as explained in the picture below)?

The correct way to prevent users from utilizing certain types (including built-in types) in Documentum is usually to configure the client. For most clients this is done using display configuration through the DD (Data Dictionary) mechanism.

However, for My Documentum Desktop this seems to be somewhat different. I have not used it myself, but take a look at the My Documentum Desktop Installation and Configuration Guide 6.7.2, page 25 -- Object type filters preference set:

This sets the root object type that generates the list of object types from which users can select in the ingest dialog box. This also hides specific object types from display in MDD.

On page 56 -- Define settings for an object type (Windows):

Default_Document_Object_Type=dm_document

I guess the former configuration setting will help you in hiding dm_document, and the latter could assist you in making a default type choice for clients.