First, i'm a vocal systems appreciater. But. The one thing that frustrates me about the journal is that there is only one journal. If I have a chatty app, it can entirely take over the journal. Set a 1GB hour al, come back in a couple days, and nothing else is left in the journal other than it logging. I hate this so much.
If I could assign some apps to a secondary journal, or better quota individual services, that would make sure I can keep tabs on my entire system, even when one app is logging heavily.