1. Not easily. Simplest thing is to delete the track (but don't sync), then type 'changed' into the advanced box (assuming 2.0b7 here). Note these playlists down. Bail out of emplode, without synchronising, and then go investigate these playlists.
2. Not easily. emplode has very little in the way of facilities for resetting the statistics. You can delete the whole lot (and your EQ, and your bookmarks) by zeroing the contents of /dev/hda3. Don't do this unless you know what you're doing, though.
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roger