walkable clipless pedal shoe to replace normal shoe?
I just leave a pair of shoes at the office and change shoes when I get there so I don't have to take them back and forth. It's amazing how much space shoes take up in a backpack/pannier. I think that even the "walkable" shoes aren't that comfortable to be in all day.  And any cycling shoes that you did want to walk around in all day would lose a lot of the advantages for having a dedicated cycling shoe, such as a stiff sole. My office shoes are just cheap ones I picked up at Walmart.  This also has the added advantage that if my cycling shoes get wet from the rain that I always have a dry pair to change in to.