why not depriortize transactions which reuse addresses?
You want the fastest confirmations? Transact in a way which is not compatible with white/black listing.
And its already a reality:
Eligius (15% network hashpower) is now experimentally limiting reuse to once per block.
I'm assuming Luke is using a hand-made mining client, but if not, how can we all institute these sorts of changes to mining nodes? I would add de-prioritising of re-used addressed to my p2pool node in an instant if it were just a few config parameters. If not, could LukeJr release or merge his mining client tweak?