- from http://demo.openmrs.org/openmrs/referenceapplication/manageApps.page it is impossible to disable the "coreapps.systemAdministrationApp" app, and this shows a Lock icon instead
The approach here should be to make a quick hack in the UI of the Manage Apps page. This should be ManageAppsPageController.java and manageApps.gsp in openmrs-module-referenceapplication.
(We do not need to make any changes in the appframework module, e.g. having "locked applications.")