OK,friends. I can manage with it.
What I suggested is not a fantasy - In the site www.babylon.com
it is possible to reedit the messages. I invite you to see how it works ( Forum)

The rule is that only Babylon staff/team
or the person that posted the message may edit or delete this message.And these are only registered users.
They also have some nice features which may be adopted here also - I suggest the 8052.com Staff to see it.

One nice feature is to give a small dialog box with options + Go:
Show topics from last 2 days.
Show topics from last 5 days.
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Show topics -- -- 100 days.
Show topics from the last year.
Show all topics.