I had same idea even before macro effects were out. You are right, fader-relative and rotary sensitivity should do the trick but since in relative mode, moving fader can't send value of 50% directly from 0 or 127 and you need to move fader down and then set macro to 0.500 with mouse or to use another button to set macros in center position before playing with it. I assume this is what you have problem with?
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