Every system is a little bit different & I can't say I recall how the system works on your 'Stang but personally I leave it on all the time & let the system sort it out.
Only turn it off for a bit of fun!!
1997 Alpine Green Probe, 18mm Swaybar, Custom Yellow & Black Italian Leather Interior, CD Stacker, Yellow Wiper Blades, Ford Australia 75th Anniversary Sticker & Badge, PRD Wires & Sills
2008 Blue Ambition Mondeo XR5, Bluetooth for work