Has anyone used the Salesforce.com Campaign Association App released on 11/14/14? If so, I would like to learn more about your use case.
"Overview
Oracle Eloqua's Salesforce.com (SFDC) Campaign Association app lets you associate a contact to a campaign from directly within the campaign canvas using a Cloud Action service.
This provide more granular control over when to send records to Salesforce, will allows for better reporting of marketing effectiveness in both Eloqua and Salesforce."
https://docs.oracle.com/cloud/latest/marketingcs_gs/OMCAA/index.html#CSHID=AppSFDCCampaignAss