I'm the solid evidence that cruise control CAN be added later, if you don't mind third party. Europe don't even have the option of cruise control or steering wheel audio control. NONE!!! I can't live without it since my daily commute cruise is 125 KM and 3 times a week sport at adding 90 KM per sport day.
I have John Gold installed and been working flawlessly. it's great. It does cost me 600 euro though .... ($903 canadian dollar).
It's really not a bad deal though .... I've paid about the same with less options.....
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View my fuel log 2013 Mirage 1.0 manual: 47.5 mpg (US) ... 20.2 km/L ... 5.0 L/100 km ... 57.0 mpg (Imp)