EXECUTE: New Server > Select 5.1 Server. Create runtime, select path to server folder, press Finish.
EXECUTE: New Seam project > select seam 2.1 configuration. Go to JSF Capabilities step.
FAILURE: No sights of server provided libraries in JSF Implementation part. If you try to add them later with Configure build path - no libraries for 5.1 server shown at all.

In old versions of JBT this problem don't exist.

Screenshot attached.