The SF world has a long history of "fix-up" novels which are really linked short stories.
The Martian Chronicles came from this
City by Clifford Simak
Winesburg, Ohio by Sherwood Anderson is a linked collection of short stories.
As far as changing stories, I've seen many an introduction that said a author in retrospect didn't like the result of a story, but usually did not change it. I was just reading an Ursula K. LeGuin essay about how she would now re-write something she wrote in the past. She added parenthetical changes to the piece. Interesting.
I'm actually in the midst of writing a 'linked collection' - my Marville stories modeled somewhat on Winesburg, Ohio
One thing I don't generally care for is when a short story it EXPANDED to be a novel. It usually doesn't work for me, though there are exceptions. This too seems to be a tradition in the SF world.
Last edited by kennyc; 07-06-2012 at 08:14 AM.