Mavericks log rotation

In Mavericks, Apple has apparently moved control of log rotation to ASL. There's a 'ttl' value to determine how long log files will stick around for. I can compress them, change the way they're named, limit them by size, etc. But the one thing I cannot find is how to NOT keep one log file per day... I want to be able to say this log file should rotate weekly, or monthly, or every X days.