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Did you know that you can turn down Rejecto’s weighting so it’s a bit less aggressive? Other options which don’t involve having to use a paid plugin necessarily are raising the vadThreshold value (this will exclude more incidental sounds) or using a grammar instead of a language model, which will only allow recognition on utterances that fit the grammar rules:
https://www.politepix.com/2014/04/10/openears-1-7-introducing-dynamic-grammar-generation/
This can be done with either stock OpenEars, or RuleORama for much faster grammars. Maybe one of these options can help you with getting a better user experience for your current app.