Join Date: Aug 2006
Location: New York
Bikes: Makino (have the parts; not yet built), EAI Barekuckle, Unknown Japanese fixed conversion, Centurion Dave Scott Ironman road bike (frame), Secret project bike, 2007 Trek Madone 5.2, Cannondale Caad3 mountain bike
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Of course you can have a single speed that coasts; most kids bikes are that way.
I don't know anything about that hub, but it seems like it's exactly what you want.
edit: I have no idea what a DMR frame is, but you could use that hub on almost any frame -- you just might need a chain tensioner to get everything right.