it would be phantastic if I could see, when others have updated a tasks that I have delegated or that I am interested in.
e.g. if the other person writes a comment or a question to me (maybe via an "@name" shortcut in the comment) it should be indicated, so I can respond.

This would also increase the interest in using RTM with multiple users, giving you more paying users .... just as a hint -)
best,
Andreas