This feature has been suggested, and is on my list for 2.0.0 consideration. My principle objection to this is that I suspect that many users would not want to turn the feature on. Particularly for myself; I may read a question one evening, but not answer it until the next day, but I don't want to have to fob off the various inevitable "How come you haven't answered me, since I know you read my message?" questions.

So, yes to the feature, but ultimately it will be controlled both by an admin "master switch," and by users' individual preferences.

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com