Hi Dennis,
Yes, when rmMapUseDefaults = false, then you have to set the rmMapZoom, rmMapCenter, rmTempUOM, rmWindUOM, rmBaroUOM and rmRainUOM values to your liking as none of the defaults for the selected network will be applied. They can be set in mesonet-map-settings.php or in Settings.php as you've shown (the Settings.php ones will override).