Sorry the code is not well formatted. This way will be better.
@SeamManaged @Produces @PersistenceUnit @ConversationScoped public EntityManagerFactory entityManagerFactory;
@Produces FlushModeManager flushModeManager = new FlushModeManagerImpl();
Mmmmh, no answer... No way, I've tested with Weld 1.1 final : it works ! It is a very good news, as I had to show a demo of CDI / Weld / Seam 3 to client, today :)
BTW: @SeamManaged was moved from seam.persistence to seam.solder and renamed to @ExtensionManaged (since 3.0.0.CR4 or before)