I answer to myself on #3 : you don't really have to type the word. What you can do is : move the cursor in front of the word(s) you want to look for on wikipedia, click twice to start underlining, move the cursor to the end of the word(s), don't click to end underlining, instead make the keyboard appear, the underlined word(s) appear in the text box, reclick on the keyboard button to make it disappear, and use the right cursor to go to the "wikipedia" button. It's about the same "trick" from the Kindle Keyboard, but not exactly the same.
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