Well, wouldn't even be possible with screen scraping. My tools have a pretty high traffic volume, and Yahoo throttles queries to it. So it's not possible in that regard.
Screen scraping... it can be done of course, but they must be doing low volume. If I were to simply add it as a feature of the keywords tracker, it would require about 20 queries per second 24/7 to Yahoo. Since they throttle requests back, it would never work with that sort of volume.
They do offer an API, but since Yahoo likes to monetize on everything, it's a six-figure initial cost to use, plus a per query charge.