Yeah, baking powder is fine for making biscuits and banana bread and such.
Definitely not in the plan for the crusty yeast breads though.

Smilingcat- I have been faithfully using the steam pan under the baking stone as recommended in the Artisan bread book....and it seems to work fine.
When pouring in the water, you have to be very careful not to drop even a drop of water on the extremely hot 450F oven door glass- I hear it can crack the glass window of the oven door if you do that! So I am very careful when I add the steam water.