We have several sites that are behind a proxy. There is currently no way to configure the proxy settings from the console. Each machine must be touched in order to accomplish this.
Since the install package is based on the default policy, even if we could add this parameter to the policy it would be problematic as not every site uses a proxy and those that do may not have the same credentials or use the same ports.
It would be helpful to have the ability to define the proxy settings in a policy and an option to choose a policy when creating an install package.