Using faders as submasters

Is there any way to use the playback faders on the Wholehog 3 as fixture submasters. Not inhibitive submasters - I want to be able to move the fader to form 0%-50% and the corresponding fixture will come on to 50%. I'm the full-time lighting tech for our church, and as much as I try to teach our volunteers, they can't grasp the concept of using groups and the parameter wheels for on-the-spot changes during a service, and having an actual, physical fader would help tremendously.

TIA
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