Jet-Pack some time ago mentioned the developer camera as substitute for the SLEW mode. (31 Jan 2017)
You should be able to zip around in a developer camera, that can be done more or less by now already. (...)
But you need the developer option in the main.mcf file for sure. I've just seen the camera in action and it looked quite usable to me.
Can you please describe how to activate this developer camera?