To make sure I understand: you're talking about the stereo fader in the Remote Layer, right? In other words, you'd like to disengage the Stereo fader physically from the current selected layer (remote) and assign it to another layer?
The short answer is, no. If there's a way to do that, I'm not aware of it. At this point, Ernie/Jamsire should chime in; he's the "King Of Remote/UDLayers", and he'd have the definitive word.
CaptDan