Often we would like to go back and re-run a prior Data Warehouse request but just add/remove a column or two, perhaps just change the date range after running a test warehouse pull, etc. It's a waste of time, and likely chance to make mistakes, having to re-define a DW request each time though.
Simply let us pull up prior requests with all fields and selections populated so we can:
A) verify what we actually did if have issues with the results we get
B) update the settings and re-run same request again