Possible change to forum threads

Recently in the Netbackup forum, someone had created a thread, and once everyone had given their ideas and tried to answer the question the creator posed, the creator went through and deleted all of their posts regarding his/her question.  Now the thread is completely useless, as no one can tell what the question was.

I feel like the Netbackup forum is a great place to learn new information about Netbackup.  When someone goes back and removes their original question, this prevents someone from building on experience of the original poster.  I made a suggestion in the thread that there should be a limit on how long someone can go back and edit their posts - say 30 minutes.  Once this 30 minute period has elapsed, the comment becomes "locked" and should only be modified by the moderator/administrator upon request from the person that made the post.  Someone saw that suggestion and mentioned that I should post it in the "Ideas" section, so here it is.