This week's book giveaway is in the General Computing forum. We're giving away four copies of Arduino in Action and have Martin Evans, Joshua Noble, and Jordan Hochenbaum on-line! See this thread for details.
While both Seam and Spring Web Flow have things in common, it isn't quite like you need a gen in Web Flow. You can create a new project scaffolding using Maven archetypes, then just add webflows, which are just simple xml documents. Seam is a bigger "framework" which encompasses a lot of stuff, whereas Web Flow is just a part of the big Spring picture of web development. Meaning you might have Spring MVC, Web Flow, Spring Javascript and JSF all in your application. So a gen for just the web flow part wouldn't make any sense. They all work together.
Web Flow documents are very easy to create from scratch and you wouldn't get any benefit of a "gen" script to create just an xml document for you. the configuration in xxx-servlet.xml is just really two entries. Again no real gain of a gen script needed here.