jeff,
For me, "casing" the tobacco means mixing a little honey with some warm water and drizzling that over a little pile of tobacco. Then I fold the wet pile of tobacco up in some parchment paper until it's nice and tight (you could just as well wrap the parchment parcel with some foil to keep it closed). Anyhow, I set the toaster oven at 200 degrees and bake for about two hours.
Be forewarned, when you steam burley like that it will smell like... I don't know what -- something grassy and "agricultural" you might say. Sometimes I leave the warm steaming chunk of tobacco in a mason jar for a few days to settle down. Alternatively, you could leave the warm, wet tobacco spread out on the opened parchment and let it dry a bit before putting it away in a jar. Once it settles down it smells really nice -- like nutty burley with a bit of honey.
To me, the smoke is amazing. Just that little bit of honey adds not so much sweetness as a minerally taste. If you've eaten straight honey before, there's something that sort of sticks in your throat and has a sort of spicy, mineral-like zing to it. That little bit of "zing" really comes through in the smoke and I really enjoy it. Moreover, the burley itself, because of the steaming process, is really, really smooth and bite-less. In fact, some of my best results have come from plain white burley that originally tasted like old gym socks. On fire. Inside my mouth. (Yuck.) But the casing and steaming process totally changed the character of that cheap, bulk burley.
Hope this helps!