You should absolutely do that when you feel the moment's right. I'm kind of a patchwork writer when it comes to longer stories, depending on how I'm feeling and "getting into the story". And sometimes it turns out one scene (or poem, but I don't think I'm really good with poems) was all there is to a story, sometimes the story is literally epic. It's awesome that we can do all this here, not depending on editors or certain numbers of pages that have to be printed.