> I'll try the http://www.wp7roottools.com/ SDK later today in my wife's Lumia, but I have few doubts that it'll just work also.
This surprisingly did not work, but on a Samsung Omnia 7 I did a "full unlock" and ran successfully wp7 root tools, which allowed me to read and write any file or registry key. Apparently, the so called "full unlock" is yet to come to Lumias, but progress has been made.