Did you know that you can use more than one emotional buffs, for example if you want to become very inspirational while cooking and very focused while doing other stuff, than you can use an extra moodlet of each to change out of whatever emotion you need. I have been able to change emotions or stay in emotions depending on what kind of buff I choose. I have been able to stay in inspirational just by cooking. You can also make drinks in to get inspirational. If a sim is Confident he is more likely to succeed in harder social encounters like engagement and marriage.
Edit: The envirment based emotional aura does not keep you in that emotion, but if you want to stay in that emotion you must view the aura picture and you can now stay in that emotion.
Edit: If you want to disable the aura of the room buff just bring some dirty plates into the room, the buff is only given when the picture buff is triggered by the room environmental score.