It could be part of the "logic" that it doesn't go to neutral every time the car stops if it has been started/stopped several times in a short amount of time/distance.
Some hybrids and engine stop/start systems are programmed like this: they will shut the engine down for the initial stop, but if you move ahead again (engine restart) only a short distance, it may not shut down again until you've gone above a certain speed threshold. Otherwise the feature may become annoying to the driver.
The neutral-to-start engagement of the Mirage CVT may be programmed the same way for the same reason.
I'm interested in seeing this feature first hand.
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View my fuel log 2014 Mirage ES 1.2 manual: 62.4 mpg (US) ... 26.5 km/L ... 3.8 L/100 km ... 74.9 mpg (Imp)