As some of you may or may not know in the OMSI editor there is an option to place a background map image to help you lay roads, place buildings etc if you are building a real map, this image is only displayed in the editor and not in the simulator.
Anyway I have been in touch with the author of RWDecal
which is a tool that is used to make decal images from Google Earth to be used as background images in the Railworks
editor, if it might be possible to make a version for OMSI, via the tool you could mark out an area in Google Earth and it would automatically produce a large jpeg of the area allowing you to use in OMSI making it much easier than doing it manually.
Here is the link to RWDecal's news page which has a bit of info - RWDecal News Page
So if you think it is a good idea please let him know.
A little look of how the sample image looks, just a small area of the 5km x 5km image, a few bus objects have been placed on top of real buses to check the scale.