I believe you can choose to have the nav map set to day only in the unconnect settings. This will keep the nav map showing daytime all the time. As far as the dash and screen dimming when the lights come on, you can roll the dash light dimmer knob on the left up until it clicks once (one click below turning on the interior lights). This will keep everything illuminated even if the lights come on.
I use this so I can drive with my parking lights on during the day (I like the look of having the DRLs and the headlight LED accents on at the same time without the headlights). By the way, any word on a bypass or fix to allow us to run both DRLs and accents without having to use the parking lights?
Hope this helps