I dont know about DAS, but the Tokyo Disneyland site has a lot of information about navigating the park (height/measurements that must be traversed), which rides are permitted, which have viewing areas in lieu of riding, etc.
In general in Japan, proving you have a disability is more difficult, and generally mental/behavioral based disabilities don't qualify the same way. And like most things, luck of the draw of who you interact with as well.
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2016 POR
2015 CS
2014 WDW-Offsite
2014 Disneyland-offsite
2014 CBR
2013 Dolphin
2012 POR
2012 WDW-Offsite
2011 ASMusic, POR
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