I must admit I'm a floor thumper when I play melodeon. I've got it licked though by putting one foot on top of the other whilst playing (sitting down of course), my foot still moves up and down but doesn't make any noise.
Eamon Coyne late of the Liverpool Ceili Band was also a floor thumper whilst playing fiddle. One night playing for a dance, he was stamping his foot so loud on the stage, it was booming through the PA. Someone threw him a cusion to put under his foot. He thanked them and put his foot on it.. then started stamping his other foot.
Then you have the 'manic' thumpers, who have both feed stamping out the rhythm alternately, efectively 'dancing' to the music.