Hi Karl,
But how about creating indices (--net, --index, --split-name-index, --road-name-config=filename)?
--net is about putting address data into *.img tiles, so this is your step 2. Others are about creating index file *_mdr.img, this is done in step 3.
How about using the same tiles, but applying different TYP to each created gmapsupp.img?
TYP is combined with *.img, you do it in step 3. You can add any TYP to any set of *img. Technically TYP is linked to img by FID/ProductCode and family-id/product-id. Probably mkgmap fills FID/PID into TYP file in step 3, but I have no experience with this process.
It would be great if documentation could give some hints to when the various options are applied or when they can be best applied.
You can simply create a config file with all options and use it in all stages. -- Best regards, Andrzej