Also, 'live mapping' occurs both on the road and the rollers. Let's get the definition straight. The term 'live map' means to write to an ECU 'live', in other words the entries you make have an immediate effect. Alot of management systems (particularly OEM ones) don't allow this, you have to do a run, make the changes to a table, then burn the data to a chip (or Eprom). That isn't live mapping, whether it happens on the Rollers or the road.

Any ECU that can be written to and the changes take effect as they happen is being 'live mapped', whether it happens on the road, rollers, engine dyno or wherever.