Oddly, when my friend John and I wrote our first novel, we wrote it entirely on the computer (260-something pages, 60 chapters in 60 days) and there was an urgency, a feverish energy to it that I was afraid it would lose if we edited it too much.

Often when I write, I have to just type as much as I can without really looking at it, otherwise I never get more than two sentences down.

I don't know about shorter sentences, as I tend to write long, meandering sentences whether on paper or computer. I often have trouble ending a sentence. (Which reminds me of a book I heard about that is several hundred pages but it is only one grammatically-correct sentence.)