Regarding dynamic load factory support. We've always supported dynamic load factors for both HA and non-HA modes. Also, dynamic load factor support was added to ModClusterListener (i.e. for Tomcat) back in 1.0.0.Beta2. However, with Tomcat you are limited to using a single load metric.
Note, there is currently a bug, though fixed in svn trunk, that prevents the loadMetricClass property from being read correctly.