Haven't heard about or seen for sale the additive you are asking about. However, a few years ago the Milwaukee transit system tried a program of additives to make their vehicles smell better. Their smell was suppose to be "spring-time garden", but when a bus passed by, the whole street smelled worse than a Walmart perfume counter! Given all the complaints, I believe the experiment lasted less than 6 weeks.
From a practical point of view, and being an avid vehicle collector (and thus a fairly experienced mechanic), I can't believe that a smell additive would in the long run be very good for your engine. Something other than gasoline is burning to make that smell, and gasoline engines and their components are made to basically only burn gasoline. Just look at all the problems that ethanol has brought about!
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All of us could take a lesson from the weather. It pays no attention to criticism.
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