Brush events on tablets

We have a shiny app where we use "brushing" pretty heavily in the UI. However, this doesn't seem to work on tablets (or phones) with touch screens. My questions:
Is there a way to generate brush events from these devices that I haven't been able to find?
What hardware combinations can/cannot generate brush event, e.g. will using a pen with buttons on an Android tablet work?
Suggestions for alternative UI techniques that work equally well or could be substituted for brushing on a tablet?

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