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Currently, the application.id config is used as the consumer group id for the underlying KafkaConsumer and as a prefix for internal topics. In most cases, this is not an issue, but some use cases require more flexibility, i.e. different naming conventions (prefixes) for topics and consumer groups might be needed.
Real-world example: In a (highly automated) multitenant setup, each team using a central Kafka cluster has a dedicated topic namespace and can control ACLs for the topics in that namespace. To be able to manage  ACLs for internal topics of their KafkaStreams app, application.id config must match the team's topic namespace prefix, and this is not always desirable.
It would be nice if the internal topic prefix could be additionally configured.

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