The exact features and workings of this planned Yoomoot tool would be worked out with the people interested in it.
It could come via a plugin or an open API.
The more people that agree with this answer (i.e. click the "thumbs up" icon) the greater priority the Yoomoot team will put on a developing a plugin or API to make it happen.
The current solutions for interaction with users leaves a lot to be desired. Most sites allow comments which are very difficult to follow at times and end in being useless in the long run. Having this tool would be a perfect fit for such a medium.