Can I sync data to Salesforce without storing it in Drupal?

Problem/Motivation

I just started using this module, and it's working pretty well. For our situation, we need users to interface with Drupal, but we don't necessarily need to store all bits of data directly in Drupal. Our clients will not have direct access SF, so the edits will need to take place in Drupal. What is the most appropriate way to push data that doesn't need to be stored in Drupal over to SF? I see that I can use tokens, which theoretically would allow me to store bits in session variables, but I wasn't sure if there was a more appropriate solution than this.