If you want to do mathematical, numerical, performance indicators for document control (regardless of TS) here are some I would suggest:
Cycle time from the time the need for a document change is identified until the change is fully incorporated into the document.
On the basis of field assessment - what percent of document copies in use are current copies to the current revision/version?
On the basis of assessment - what percent of documents meet document control standards (format, review cycles, etc)
Cycle time from the publishing of a revised document until affected drawings are updated (if applicable)