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Are you thinking of creating a Salesforce Custom Object where the Marketo's Sync User updates/changes are stored? If so, I would avoid doing this mainly because Marketo cannot write to a Salesforce Custom Object. The Marketo Sync User updates should really only be visible to the sales team on an Activity Log panel where they can see when a lead was changed. Perhaps your page layouts are different hence the clutter feeling.
I am pretty confident your concerns can be addressed by either changing the Sync User permissions or the rep's page layout.
Thanks for replying! We ended up turning off the Activity Syncing to Salesforce and all the syncing is going into the Marketo Sales Insight section of Salesforce.