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To the Neturei Kitniyos who are also defending the practice of observing an extra day of chag in Erets Yisrael, should note that the Chacham Tzvi wrote that:
"...it would be forbidden for them to observe more than one day because of baal tosif. It is known that one who sleeps on the sukkah on Shemini Atzeret is punished by flogging and similarly on Pesach on who observes one additional day of holidy beyond the requirement of the mitzva has violated baal tosif."
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http://kitniyos.blogspot.com/2007/04/in-pursuit-of-emeth-second-day-of-yom.html"