Just came back from NAMM and talked with the techs from Yamaha Japan. I've learned more about sampling with the T2.
First, you cannot program a user drum set but......
You can create a custom voice where you sample a different drum sound on each key and then you can use this custom drum voice using track 9, not track 10.
You can also use custom voices (sampled sounds) in the style tracks as well.
Also, we figured out you could create a custom loop and assign it to a multipad. The only problem is that you would have to have the BPM be sampled at the tempo you have made the style play at.
I hope this helps,
Kaye's Music Scene