In Mapsource this won't be an issue, only in Basecamp many POIs cannot be controlled by mgkmap anymore.

Also on modern devices like the Oregon 6xx setting the POI levels on automatic will lead to cluttered maps.

See for instance this example of noexit=yes [0x5800 resolution 24] in Basecamp:

https://www.dropbox.com/s/pyqb6fyrtx2pbgz/no%20through%20road.jpg?dl=0