Half the screen estate is already taken up by the keyboard. Could the body section of the question asking screen be popped-out/expanded when focused? I can only see one line of text as I am typing questions (about 40 characters). The page neither scrolls nor expands appropriately, and it's a shame to see a textarea smaller than a textbox.
I believe a picture speaks a thousand words:
Currently the best work-around is rotate the phone to use landscape mode:
Something could be done to make the body textarea fit the top in portrait mode, like this: