Zeta, otsaloma, MartinK, and taixzo: thank you very much for the discussion, its very helpful!

I will look into how to register QML type in the library and make it available for all apps. Probably would ask for technical pointers in devel list, that may save some time.

Converting Poor Maps and modRana to C++ shell will through out lots of neat packaging work done already, make it harder to compile/distribute (noarch vs arch-compiled apps) and is just plain untidy. If we will have to get apps out of the store, so be it. Maybe we could also negotiate with Jolla - in the end its a small community and these map apps are "must have" from user's point of view, I believe.

Edit: Zeta, thank you very much for the podcast and the code! Note that we now have an access to the map style editors that are quite good and simple to use. So, it should be simple to make new styles - much easier than it was with the Mapnik solution used by OSM Scout Server.