As per my knowledge, you don't need to do any additional configurations for this. We developed ant scripts for non-clustered environments that worked absolutely well on the clustered environment also. We refered single soa_server1 in the deployment scripts. The default coherence rule of Weblogic replicates the deployment to all the nodes under a cluster, hence it was deployed to second soa_server2 instance automatically.
Try and let me know if you face any issues.
I am having the same issue. When ever I deploy the application it is going to Manager server 1. Application is not deploying to Manage server2.
Application deployed, only after restarting the Manage Server 2. Please suggest is this the right way to deploy an application in SOA Cluster.