Proportional parameter change behavior

I've noticed that when changing a parameter for a group of fixtures that already has a different value for each parameter, all fixtures change proportionally as I turn the wheel, as expected.
However, when I get to the parameter extents (ie, 0 or 255), and spin the wheel the other way, the proportions between each fixture are still there instead of all starting from zero in sync like they had in hog2.
I find this annoying if I'm trying to grab a group of fixtures with different values and change the value so it is consistent across all fixtures. This is especially prevalent using media servers, as different layers have discreet effect values making this kind of a pain to 'reset'.
Is this an intended effect of the parameter wheels?
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