It's always good to ask. The Roo Flex add-on had been incompatible with Roo 1.1.0, and I've been working on the rich web chapter. I had checked in with Jeremy Grelle, the lead on the Spring Flex Integration framework, and he let me know that he got everything going again with a recent snapshot.
If you'd like to play with the Roo Flex integration libraries, here's what you need to do:
Download the latest snapshot jar for the add-on here (can't guarantee that it will work the same way for you, but the one 11/20 worked fine for me).
Install the JAR
Put the add-on JAR in the roo-1.1.0/bundle directory
Install the snapshot repository
Edit your project's <repositories> section and add:
<name>Spring Portfolio Snapshot Repository</name>
You have to do this for now, because the Blaze DS 4.0 integration libraries aren't checked in to a final repository.
Install it in your project
Now, just use the flex setup command to install the Flex scaffolding engine. When you want to build a scaffold, experiment with the flex remoting command to generate a scaffold View class for your Scaffold, such as:
flex remoting all --package ~.model
Just use mvn package jetty:run-exploded to kick off your application (Tomcat is fine but I am partial to Jetty for embedded maven runs). When the server starts, make sure to hit http://localhost:8080/appname/appname_scaffold.html to view your scaffolded UI.