Backlash I would think should work when jogging. I never Jog as such as I use a MPG for that but backlash works fine with the MPG so I see no reason it would not in keyboard jogging mode.
You dont need to have Mach ask which plugin to use each time, you just need to do the reset device select when you want to change to a different plugin, once done then you can choose the Dont Ask me Again option and it will load the chosen plugin. Obviously if you load a new plugin in the future then you will need to do this again.
Hood