[YakkoW]

Thanks, Curt. I did in fact find and download your script, and I agree that it's helpful as a temporary workaround. Thanks for making that available!

Of course, as you say, it's not as graceful as built-in filtering, and does require a few extra steps (adding the text, searching for the text, then removing the text). It's far better than nothing and I'm very glad you wrote it, but I'm really hoping that in the future, OmniFocus will include a built-in filter for this so that we don't have to create workarounds.