Just using what I can remember from scraps I've read here and there on the Forums, but having an "Anti-Saving" addon isn't possible. I think (And correct me if I'm wrong) that it's due to Saving being Client-Sided, so a Server-sided Add-On to prevent saving wouldn't affect the players saving bricks.
I could be completely wrong with that particular reason, but I'm sure that it's been said many a time, that it's not possible to stop people from Saving Bricks, for whatever reason.