Is there a way to extend the Call REST Service activity in Microflow?

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The reason is because I want to implement NTLM Authentication. I can ensure that the Type 1 Message and Type 3 Message required for NTLM Authentication is already correct, because I developed another alternative solution using Java Action which will directly Authenticate using the same library.   I have been trying to simulate the NTLM Handshake with 3 Call REST Service for sometimes now. Unfortunately, I haven't been successful up until now. Somehow the 3rd Call REST was not read by the server as the continuation from 2nd. I must have been missing an important Request Headers or other property to do this.  
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