It seems to me that adding the CLI flag is the least of the work.  You then have to make it compile cleanly :)  (That's why I said 'ambitious enough').  That is, (as I undersatnd it) we've done a lot of work to not have compiler warnings generated during compilation, and we don't want to backtrack on that.  Over time we've cleaned up the code so that we could make stricter compile flags the default, so this would be in that tradition.