Convince FreeBSD to include a different syslog distribution in the base system, then we'll talk. We use what they use. :-)
You can use the syslog-ng package if you want so you are not limited to what's in the base system.
It's too late for such a change in 2.4, maybe 2.5, not sure what will be in that role for 3.0 but it's still early there.
We've already been talking about dropping clog in favor of sensible log rotation and retention since space constraints are not what they used to be in the past, even with RAM disks since most systems have more RAM available. Once we remove the clog-style log requirement then it frees up a lot of options like using syslog-ng in base.