Thanks for the reply.
I don't want to tweak the application, but to change the application users' environment.
The application will be activated by users from different user groups (end-users, testers, and developers).
1. The end-users' KDE environment must be as limited as possible, i.e.
no taskbar, no menus, no shortcuts, ..., nothing except the
application.
All the normal user's activatity has to be completely disabled.
2. The testers KDE environment must be limited to the preliminary defined options, but still such a user can start Xterm and etc.
3. There are no limitations for the developers.
The problem is, how to configure all this using the configuration files, without the necessesity to separately re-configure every end-user/tester.