I don't know if anyone else did this so I'll post it anyway...
I own the PS2 dance pads with one inch thick foam inside the plastic zipper case. My room is very carpeted. This proved to be a problem, but not one without a solution. I used plywood and cut out the shape of the foam. After inserting the plywood underneath the foam and zipping the pad back up, it worked wonderfully even on very thick carpet. It's a very cheap alternative to the metal pads but unfortunately still will not work with shoes...
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