I have the same 'feature' on mine, Cort. <G> Apparently, the middle pedal often wasn't connected to anything. For player pianos, maybe it served some purpose, although I can't imagine what that might have been... For some pianos, depressing the middle pedal cause a thin bar to drop between the strings and the hammers, muffling the sound so that kids could sit there and bang out scales and 'Chopsticks' for hours on end, and no one would try to kill them for it.

Mostly, it was so the salesman could say, 'It has not one; not TWO, but THREE! Count 'em; THREE PEDALS!!!' <G> Many of the European pianos only have two pedals. Perhaps Europeans aren't as gullible? <G>
Cheers,