I agree the ketch mizzen tends to complicate seating in small boats. It kind of traps the helmsman at/near the tiller, behind the mizzen. It often necessitates a double-sheeted mainsheet, which can get tangly (at least in my hands).
Remember, too, Alex's comment on the sprit/lug thread that the Alaska's ketch mizzen is too far forward to reliably hold the bow into the wind for reefing.
From the diagrams in the Alaska plans for the suggested reefing sequence, it seems a small boat ketch rig is a bit fussy for sail reduction, too.
Alaska reefing.jpg
The need to move masts around, and switch out the mainsail for the mizzen at some point--as someone on the WBF described it, using big boat tactics in a small boat--doesn't seem like the way I'd like to do it. And of course by the time you're needing to make these changes, it's windy, and likely wavy.
A single sail is simpler--especially if the ketch mizzen doesn't hold the bow into the wind for reefing anyway.
For 2 sails, the large main/tiny mizzon (100 sq ft + 20 sq ft) in the popular lug yawl seems like a much better choice, for numerous reasons.
That said, one of the main reasons I chose the Alaska is that the ketch rig looks a lot cooler. Another big reason was that the planked decks Don specifies are just so d@mn beautiful.
My Alaska ended up with no mizzen, and no planked decks. It suits me just fine.
Tom