1) Right handed
2) Denmark, Europe
3) Knife in right, fork in left
4) Knife in right, fork in left
5) Right hand (well, apart from the fact that I don't like cheesecake

)
6) Right hand
Frankly, the whole switching hands baffles me a bit. It just seems like an exceedingly complicated and time consuming way to eat.
Also, apart from cutting steak (or any other kind of meat), what about the rest of the food on the plate? I also use the knife to help gather the potatoes, vegetables, rice etc. onto the fork.
I would also think that if you had any kind of sauce/gravy with your meal that it would leave a stain on the table, if you just put the knife down by the side of the plate, or run down the length of the knife, if you put it on the side of the plate (handle leaning on the table).
I also use just a fork from time to time, but it's generally only in very informal settings (when I'm by myself or with my parents).
Oh, and Hypersmurf, you forgot a question:
7) How do you eat spaghetti?
Answer:
7) Spoon in left hand, fork in right
