CRM 'Connection' to Desk - "Use Credentials of logged in user"

From Desk to CRM, I can create a Connection in Sigma (to CRM) that gives me the option to Use Credentials of logged-in user.

In CRM, there is a separate option in setup for 'Connections'. As there is no specific Desk connector, I can create a 'Zoho oAuth' connector (i.e. "zohodeskfromcrm"), which allows me to talk to Desk from CRM using the following:

response = invokeurl
[
URL :< URL>
type :POST
parameters:data.toString()
connection:"zohodeskfromcrm"
];

The problem is, all function calls originate from me, even if the workflow is executed during another user's session.

My question:

Sigma Connections support 'Use Credentials of logged in user'
Can CRM connections do the same?
Is there a better method to make API calls to Desk, from CRM, in an efficient manner?
(For example, creating a private comment against a ticket in Desk from a logged in CRM user)

Thanks

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