I used to have a pair of 63's in a roughly 12 by 12 foot room, and I've also used them in a 13 by 31 foot room. Of course they liked the big room better, but were still quite enjoyable in the small room (though I had to pay a lot of attention to addressing early reflections).
If you have five feet available behind the speakers, then chances are you'll have very good depth of soundstage (assuming you can diffuse the backwave - I use fake ficus trees). Despite their directionality I think you'll still want to treat the first sidewall reflection zones, as that will reduce your awareness of the walls' presence. Once again, I prefer diffusion over absorption, unless your room is overbright. And even then, be careful not to overdo the absorption - a little goes a long ways in a small room.
Having the speakers a good 5 feet or so out in the room is also good for the bass; with a dipole, the bass is reduced by proximity to the "front" wall because it's the out-of-phase backwave that's being reinforced. If you need to improve the bass, move your listening position closer to the "back" wall (the one behind your chair). Bass traps in the corners behind the Quads can also increase the bass because they're primarily absorbing the out-of-phase backwave.