In the Utility area under project settings (common) you can set the bottom value and the top value for the user 1 and user 2 touch slider settings - so by swapping them around, this can achieve what you want (If I understand you correctly).
Direction setting for touch slider assignments
We could really do with a direction (and pref attenuation too) for the touch slider destination settings.
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^ ahh nice one thanks for the heads up --- RTFM LOL
No worries! RTFM, nah, that's what forums are for :)