I messaged the author Iza a long time ago and asked about this, he said its not possible and not in the plans. For bg's I generally just make the repeater region larger and have that with the options for grouped and sort by name. After getting use to it, I rarely bother with private tanks.
Also I highly recommend putting your dispels on the mouse-wheel. With my druid healer, cure poison and remove curse on up and down.
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