I created a kit for my father. First pass I only included me and my aunt (his sister) but the results were too broad. I'm rerunning the utility with 3 additional cousins based on my matches here and at GEDmatch as well as including my mother's kit in the spouse box so as to eliminate her contribution. In the first pass she showed up as a pretty close relative to him which I know to be false.
I've sent email to John & Curtis with the suggestion that they incorporate a way to update/amend/refine existing Lazarus generated kits so as we add cousins we don't generate a new kit number. That way anyone we've shared the number with won't have to be updated. We'll see what happens.