How about a thanks "FLAG" if added to the responses as like rating?

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When normally like and wish to thank the responder to our discussions. We can't stop our feeling in some cases unless we add a line as an comment to the response. But what I think is that as like rating syatem if we would be provided with a small flag symbol which when ticked or marked the user who replied could see that we have read his response and wanted to "thanks." I think this would avoid further adding comments and loading the server as well as time saving point of view. In addition to the "add comment", A flag as "THNX" should appear just next to the response, is what I wish. What about you? Don't you want to have this provision? Will it not save our time.