We actually have released the "remote control" feature with SDK 1.3.0 (the current version is 1.3.5). I think we don't have a sample application for this but there is some info in the documentation (see com.adobe.rtc.collaboration.ScreenShareSubscriber.requestControlling(userID)).
Basically the "viewer" application will have to request control and the person currently screensharing will be prompted to accept. If accepted the "viewer" will become able to control the "publisher"'s machine.
I did see the documentation note about the feature not being implemented but it turns out that when we added support for remote control we didn't update the note. Will be done with next version of the SDK (and thanks for pointing that out).