[syslog-ng]Syslog-ng timed sync

Is there any way to be able to do a timed sync? What I want to do is be able to have syslog-ng buffer about 10 lines, but if nothing is logged within, say, 10 seconds, syslog-ng will automatically flush the buffer to disk. This way, if the logging is bursty, the system doesn't get strangled by the I/O writes during the heavy times and I don't get caught waiting long times for more logging to fill the buffer during the quiet times. I'm concerned about using sync=0 because during the times when the logging is heavy, it take a great deal of I/O to write to the logs. Any thoughts? Thanks, -Hugh