Thanks for your answer! OSM is awesome, I use OsmAnd+ and have just discovered Organic Maps recently. I still haven't found a project that can do what I'm looking for, after trying uMap, Mapotic, RideWithGPS, Maps.me, mapy.cz, Bing Maps, MapQuest, Organic Maps,and others. So I might try and hack together a custom solution with KML export/upload.