GenericUserBasedRecommender filter user

When I use GenericUserBasedRecommender, want to by implementing IDRescorer to filter the user encountered problems: GenericUserBasedRecommender by neighborhood.getUserNeighborhood (userID) method to achieve the user, and it did not Rescorer parameters, without using mostSimilarUserIDs method that have this parameter, if use mostSimilarUserIDs method, estimatePreference method is used in the neighborhood, how to achieve the best?

Thanks, pol