Can you not tell from the running system what the currently-applied values are? That would address your concern. OTOH, if a nonsensical value without a comment (and, at a minimum, an indication of who made the change, when, and a reference to a bug/case/URL with the full details) is present, you have nothing to work with. Your only option is to change it and see if production breaks, and that is never an option until until production is already broken. At which point, you always discover that there are, in fact, multiple configuration values set that make no sense.