Unit system Localisation: split settings for System and Map

Settings: Localisation: Unit system: Metric, Imperial or American

Can this be split up in 2 columns: System | Map
eventually with a choice [v] Units split between System/Map

where you could have
- the map displaying the Local speed limits (icon)
- the System panels/directions in another choice

examples:
UK car driving in EU: system in Imperial, map in Metric
EU car driving in UK: system in Metric, map in Imperial
CDN car driving in USA: system in Metric, map in American
USA car driving in CDN: system in American, map in Metric

I'm struggling making the conversion in my head between Imperial and metrics in busy traffic.
Cars dash is metric, instruction is yards (yd) miles (mi)100. I'm not used to Yards or Miles
However I do like to see the speed limit as it is on the road.