Entity fallback threshold

Is there a way to set an entity fallback threshold? I am only trying to use an NLU pipeline with the following config:

   - name: WhitespaceTokenizer
   - name: RegexFeaturizer
   - name: LexicalSyntacticFeaturizer
   - name: CountVectorsFeaturizer
   - name: CountVectorsFeaturizer
     analyzer: char_wb
     min_ngram: 1
     max_ngram: 4
   - name: DIETClassifier
     epochs: 30
   - name: EntitySynonymMapper
   - name: ResponseSelector
     epochs: 30
   - name: FallbackClassifier
     threshold: 0.7
     ambiguity_threshold: 0.3
     fallback_action_name: "action_default_fallback"

I would like to be able to set the fallback to say .7 like my intent threshold but I cant find out how to do it.

I am using rasa 2.0.0.