With Developer Studio, we don't lock you into any one JavaServer Faces implementation. Select the one you want to use for your project.
When you:
Create a new JSF project
Add JSF capability to any existing Eclipse project
Add JSF capability to any existing project (created outside JBDS)
You can always select which JSF implementation to use.
You can also create your own custom JSF environments.
JBoss Developer Studio will add all the required libraries for the selected version to your project.