Thanks Christian, I'll look at it.
Also maybe useful info for others. I have decided to go little bit different way in the end. Since next version will be in Locus three versions of MapsForge library
- quite old for maps version V2
- heavily modified and optimized library for all maps V3 (LoMaps and most of current maps) that will also work with themes version 1, 2, 3, will offer auto-loading and work with LoMaps Poi DB
- current unmodified version of MapsForge library (currently version 0.6, maps V4) that will work only with map themes version 4, no autoloading, no POI Db
Locus automatically decide which map renderer use by version of map.