Sharad, I'm interested in implementing MoreLikeThis support in the Dismax request handler (see SOLR-295) and it seems the best way forward is through the search components idea suggested in SOLR-281. I'm not actively working on it at the moment either but I think it's an important development and it would be great if you can make some progress. Once the interface is standardized I'll have a crack at expanding the MoreLikeThis suppport.
cheers, Piete
