The Payment Hub EE's Helm chart picks sensible defaults for most configuration options, but it's certainly possible to customize all aspects by depending on the Helm chart and adding a custom values.yml file. This way we can fine-tune most aspects of the deployment, including but not limited to:
number of Zeebe brokers in the Zeebe cluster
number of partitions
replication factor
CPU and IO resources allocated to the orchestration engine
whether or not Zeebe's Elasticsearch and Kibana are enabled