I too believe I attempted this approach without success - but it was sometime back and not at our current release (7.7.1 - but likely looking to go 7.7.8 in the next quarter). I'm not sure I can really predict a useful initial value, but in a lot of cases I believe I could pick a "throttle". Not the most elegant - but would offer a potential approach.
I suppose then that there is nothing on the development roadmap to change the original behaviour?
Terry