Lots of things:
Remembers how you've answered a question in the past and offers you the chance to answer it the same way.
Lets you select a bubble by index (1 = first, 5 = fifth, 9 = 9th, etc.) with the number row, then automatically proceeds to the next question.
Lets you select a bubble by proportion (1 = first, 5 = middle, 9 = last) with the number pad, then automatically proceeds to the next question.
Lets you answer a multiple-choice question by starting to type. As soon as you've typed some text that's unique to a given answer, it will click that answer.
Adds character counters and word counters to every text input.
A few more things that I might be forgetting and will add later.