about your first point.
[Scala actors](http://www.scala-lang.org/node/27499) have been deprecated and Akka actors have become scala actors. So in case we change the name now  we would have to do it again when we migrate to scala 2.10. And there is no other [actor framework](http://en.wikipedia.org/wiki/Actor_model#Actor_libraries_and_frameworks) in scala I know off at the moment. 

About supervisor-worker model, its like an actor that starts another actor(worker) who can send data to its parent. And has features for fault tolerance of workers etc.. Is that all I have to mention in comment, Or I missed something?