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It was up to developers,we cannot know.You can contact xperia care:
http://www.sonymobile.com/global-en/support/contact-us/
Guys, seriously, who can press two buttons which are separated by 3 mm?
I tried with one finger and couldn't do it. The buttons are too separated to press both at the same time.
Two fingers is also almost imposible, I can't get near the buttons...
Although it's not an ideal combination, I can easily press both buttons and get a screenshot.
Maybe you need to get used to this as well...