The instructions to set up a cluster in the Installation Guide include steps to configure Quartz.

However, on EAP 7 based installations, users don't have to use Quartz in clustered environments, as EAP 7 supports clustered EJB timers as well:
https://docs.jboss.org/author/display/WFLY9/EJB3+Clustered+Database+Timers

From the BPMS perspective, as EJB based timers are the default, this requires only the following configuration change:

<property name="org.jbpm.ejb.timer.tx" value="true"/>

All other required config changes are at the EAP level.

The BPMS Installation Guide should list this option as it simplifies the clustered setup, and removes the dependency on the third-party Quartz library when running on EAP.