Batching quota clone updates

Hi,

I like the quota count+clone configuration. However, I'm wondering if the cloning process could batch its updates into chunks, or spread them out over time?

The clone updates happen whenever the quota is updated, typically this is fine, but when a tsunami of spam comes resulting in delivery to every user on the system, then can be quite overwhelming for a sql server to do an update for every user.

Thanks!

-- micah