I am really desperate for this feature. I have a project/idea that I've had on the back burner for a number of years for a device that will automatically replay or skip certain parts of a clip within Ableton based upon the position in the clip. I have every way I can think of to get this to work but the limitations of the API are really standing in my way. I know this is a feature that many other people are interested in (see MLR on the monome forums) and it would be such a boon and an end to such frustration for me personally.
The feature is available through the Live GUI by using the speaker icon so it would seem that it wouldn't be too difficult to make it available in Max.