Aye that could probably be used for such purpose. We have been trained over the years of making posts that the post icon is just an anchor. There are also about 10 icons that have nothing to do with mood there

It's not really thought of in most minds as a mood icon. Maybe renaming it from post icon to Mood icon will put people in the right frame of mind on how it is used.. It would also would be nice to have a quick mood selector off to the right when you do a Quick Reply.. No way to change that when using quick reply etc..