After living with this issue for several months, I would say adding capability to open an UR database in virtual read-only mode while the underlying file is writable is definitely more important than figuring out how to stop what turned out to be tiny amounts of data (probably polling) when syncing files with Windows Live Mesh.
My scheme with home, work and laptop (travel) UR databases sync'ed up to all three locations works fine as long as I don't open the two "remote" files. The moment I open a remote DB in UR I get a location_(computerName).urd shadow copy synced to all 3 locations which quickly becomes a mess.
Hope you can fit "open and search DB's in virtual read-only mode" somewhere in the already packed road-map.
