Update time...
In April (366 days after I drove the car off the lot) I took my car to Dufferin Mazda to see if *they* (as opposed to my selling dealer in Whitby who just reset the computer chip) could do anything about the rough shifts.
Without batting an eye they said they were gonna replace the entire transmission. I'm like, ok, cool! And it was only gonna take a day. I figure they were using my car as a guinnea pig. I'm cool with that. (Here's hoping they use me as a test sample for a new MP3 player, the current stock model SUCKS :-| )
I saw the price on the computer screen: $10,000. TEN THOUSAND. Sh!t, they might as well give me a new car for that price

.
Things seemed ok for a short while, but it still shifted not all that great. It wasn't the rough shifts that I was used to, especially the whip-lashed ones, but it was still not as smooth as from 3rd to 4th: imperceptable. Perhaps cuz it's only a $16,000 car, who knows. My next car will be the 760Li, thank you very much.
Occasionally, as you report benjz, I get slightly rougher than normal shifts from 1-2, even nowadays in this 223432423 degree weather (Toronto).
So, not sure what my next step is...I'll wait until winter and see how things go. By the time I get this thing solved, my 4 year lease will be up and I'll be putting a cash down payment on my BMW (dance).