In Confluence 6.10 we released the read-only feature for data center.
The read-only mode admin page shows a list of add-ons, and currently ATST is listed as incompatible. As I don't think you write to the database at all, I think it is probably a case of just adding the annotation that your add-on is compatible.
All the info on how to do this can be found here: https://developer.atlassian.com/server/confluence/how-to-make-your-add-on-compatible-with-read-only-mode/
Yell out if you have any questions.