I'll take the credit for that!
i requested it a few weeks ago... i can't tell you how much time i have spent in the middle of the night thinking "... let's see.., minus 200.., plus 20..."
mostly i was doing the reverse bearing for laylines - i had been thinking for years of asking for it.., and finally got around to it.
many thanks to Nick for incorporating it pretty much right after i emailed him - that's what makes expedition such a great tool.