The Struts Controller Spring config for actions should be done in action-servlet.xml.
This file should contain a bean entry for every action in your app and they should be singletons. There is normally a base action class that is injected with the service all your actions will call. You can use mock services by overriding this.
Your app can have any number of entry points. Each of the entry points would have an action that can just be configured in spring to use the class edu.mit.mortar.controller.action.GlobalEntryAction. However, they must be named XXXEntryAction (where XXX is some name you choose), otherwise the session restart mechanism will cause your app to loop infinitely.
For SAP apps, your base action should be the class edu.mit.mortar.controller.action.SAPBaseAction (which is usually the default in the skeleton).
The Search Help actions are also configured here.