Hope it is right place for a feature request.I think that Weka (http://www.cs.waikato.ac.nz/ml/weka/) would fit into the Pipeline Pilot Analysis & Stistics collection nicely. It provides more machine learning algorithms than R and a lot of feature selection algorithms/wrappers. The PP java API apprently would make the such integration smooth and fast. If the Weka model bulding GUI can be incorporated, then it would be a killer application.

Best
Vlad