It is the servers themselves that must be set to use Load-Balancing or Pooling -- when they are configured. All of the client applications (including EG) make requests of the servers and then, those requests are executed/performed using the SERVER configuration. So, if a SERVER has been configured for pooling or load-balancing -- then the request will be processed using the server setup.
I do not believe there is a way in any of the client applications to directly interact with or do more than select the application server context which should be used for a particular session.
If you have particular configuration problems or issues, Tech Support is the best place to look for help, as each company's configuration of the Enterprise Intelligence Platform servers is very likely to be different. To contact Tech Support, refer to: http://support.sas.com/techsup/contact/index.html