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The only thing that I can think of is the DCA mute group function where the fader can be locked to unity to use a DCA as just a mute group. The fader will stay on 0 electronically. It can be physically moved but will move back to 0 when released.

There can also be some strange behaviour if two or more faders are ganged and the user puts their fingers on both and tries to move them at the same time. They can become unsure of which one is in charge and when you let go they jump to a position different from where you put them. They’ve always gone lower when I’ve seen it happen.

None of these are really like what has been described but may give you something to think about.