I agree that "walking" doesn't really describe it best, since when you shop, do housework, etc., that's not usually at a pace of walking for exercise, and it's not constant.
I think most folks who enter all their activities (cooking, shopping, walking dog, household chores) enter the time of each for those, and just have the 10K steps as their personal goal, not reflected in the activities, per se...is that what you're asking?
"If you drop an egg, you don't say, 'Oh, shoot' and drop the other 11, do you?"
-Source unknown, but obviously brilliant
Reached goal 4/16/2010...but kind of afraid to look these days