I was about to report a suggestion to Logos that they keep track for us (in our resources) of what typos we've reported so that we don't waste time reporting them again. But then it dawned on me that I could do that myself!
I've created a special highlighting style (in 4.0b we can create custom highlighting styles) to mark typos that I've already reported. Here's the style I'm using:

And here's what it looks like in the text:

And you can blame Mark Barnes for goading me on to search for "fart" in my library which is the reason I found this typo in the first place. [:)]