[mkgmap-dev] Merging few .img to gmapsupp.img - typ error.

Hi. I'm trying to merge few .img files (generated with mkgmap from osm data) into one gmapsupp.img file. Also, every .img file was created with own customization, own TYP file, ...). But, when i use java -jar mkgmap.jar --gmapsupp a.img b.img, it overwrite their TYP setting. :( Is there any way to merge .img files, but keep their TYP file settings? :/ Thanks, ~ honny