I had not.

I probably should add some logging at some point to determine how much it's even doing. I think it amounts to about a 20% boost in the best of times.

Other things I threw in at the same time that someone probably should add to one of the XP helpfiles: there's a similar effect for Battle and mages, and caballed characters get a (fairly small, I think on the order of 5%) boost/penalty for killing things that are easily identified as cabal enemies/allies. E.g. Battle gets a small bonus more than anyone else for killing mage casting stuff, Outlander gets a small bonus killing enemy races, Tribunal gets a little less XP for killing stuff that attacks criminals, and so on.

Edit: If it's not already clear, I have severe CF-coding ADD. It's not uncommon for me to get a little idea, put something in, and then completely forget it exists until someone mentions it.