Comment 8 for bug 1155205

I think on balance it's probably better to keep it off by default for Raring. It's easy for people to turn it on if they want it to test and/or develop user jobs. Seems like an ideal thing to enable right away in S-cycle.

The rest is fine IMO. I'm happy to approve that as long as we keep an eye on stability and execute the reversion plans swiftly if necessary.