Cute, but there don't seem to be any reasonably paced tracks.. it's all for competition.
http://www.nabble.com/-Fwd:-StepMania-for-retirement-homes---t3718804.html - for retirement homes - but then licensing and legality becomes an issue.
http://www.redoctane.com/ignitionpadv3.html - this will be our pad. I hope it can sustain a big guy.
http://www.lamusica.com/ddrkwondo.html - handy if one is attacked, and there's a ddr mat nearby.