The Map Layers are initially configured via caddbm, in a few places, e.g.
1. Geographic>Map Data Sources
2. Parameter Records list cad>CadMap
3. Parameter Records table cad>MapLegend
These are then extracted into the mobileMMapSettings.xml file and placed on the MPS machines, typically under WsgApplicationData\configurations\customPublicSafetyMaps.
I think the extraction utility is delivered with I/MDT, let me see if I can spot it....
Look in the MPS Configuration Help (delivered with MPS to the Documentation\en folder as MobilePublicSafety_Config.chm) under the Extract Mobile Files Dialog Box section.