I think that the "Redirect me to Questions home page." checkbox under the ask a question form should be ticked by default.
I don't know if many people ask multiple questions one after another (I know I just have but this is a special circumstance :)?
It just feels like the right behaviour that after you post you are taken to the list of posted questions.
Also I dont know if I missed it but does this form give any visual feedback to say that the post was successful? It could be confusing and make people think they haven't posted (mind you as I just said we don't see double posts that often this probably isn't that confusing)