Rework the procedure in this topic to make it more clear.
I'm comfortable leaving this how it is. It is really one procedure with two alternatives in the first step. Leaving it as is is more helpful to customers, as they can spot the differences between IIS 6 and IIS 7 configuration more easily.
There's no right or wrong, so I'm moving to VERIFIED. I won't be using more than a single procedure in any of my own topics however, as I feel that it's a very comfortable definition for me of what a topic should be, and where to bring out the scissors. If only because a single procedure helps reinforce the discipline of the topic-based model (with a pretty literal view of what the DocBook element represents, admittedly). You've got a really good point though, so this was a good edge case to think about. Thanks for taking the time.