Thanks for the details. Sounds like this question is not really about
the Earth plugin, but here's some quick answers:
If you just want to save an image you can go to
maps.google.com and
print out your area of interest and then annotate that.
In Google Earth you can do File -> Save -> Save Image.
Neither of these does any type of satellite -> road conversion, but if
you want to add data we don't have and provide it back to us, you may
be interested in
http://mapmaker.google.com ... here you can use
satellite imagery and other data for context and create roads and
other features directly to our map. After your edits are approved
they will show up in Google Maps and Google Earth. MapMaker is
available in over 180 countries (listed at
http://www.google.com/support/mapmaker/bin/static.py?page=guide.cs&guide=30028&topic=1094318&answer=155415&
)
Cheers,
-Josh