I am also looking for a less verbose logging method.
Also, it is not really manageable to create a separate .xml log if you transfer every minute (or more often) for example.
Perhaps add a maximal log size setting, where the oldest lines are cycled/removed when size has been reached?
Sorry, but I would like to avoid adding yet another logging format. You can process the resulting XML, store the information you are interested in into a any format you like and delete the XML.