Addons can't shut down the Lua error system; the only way to do that would be to stop the Lua interpreter from running, which would stop all addons and many other parts of the game. BugSack's throttle just applies to BugSack's alerts -- if you get 1000 errors at once, you only need one "hey, you have errors" alert, not 1000 alerts. All of the errors are still viewable if/when you want to go through them, though.