I imported an existing JSF project using File->Import...>Other>JSF-Project and it worked great. It has a folder structure like this:

my-project
my-project/build.xml
my-project/docroot
my-project/docroot/WEB-INF
my-project/docroot/WEB-INF/src

As I said, the importer did a fantastic job of finding everything in my JSF project. However, on my "Ant" view, I am unable to select the my-project/build.xml file.

The importer created a project folder in my $HOME/Workspace rather than in the project directory itself. This is actually a consequence of RHDS-274.

I am able to associate an "Ant Builder" with my project, instead of the standard Java Builder. Unfortunately, this does not enable me to execute specialized targets within my build.xml file, whenever I want. Basically just clean and build.