The following article uses options that are available starting with the Professional edition and project type.
This functionality can be achieved with advertised shortcuts. Here are the steps:
2. Go to Install Parameters Page and make sure that the "Installation Type" combo is set to "Per-machine if user is administrator, per-user otherwise"
3. In the Files and Folders Page create a shortcut to the main EXE of your application in the "Application Shortcut Folder" directory
4. In the Shortcut Properties Dialog check the "Advertised shortcut" option
5. In the Organization Page make sure that all the components are under the same feature
Now, when a user (other than the one who installed the application) uses the shortcut, the feature which contains it will be installed for him (the registry entries will be created under HKEY_CURRENT_USER).