an "Analyze All" or Check-Boxes for "Analyze Checked" (or both) would be nice. I have up to 8 hard drives connected at times, and analyzing them all individually is a tad annoying.
An analysis scheduler might also be an interesting addition. Would probably need logfiles to be saved to be practical
Only a tad, though. I've never really had a problem with Defraggler. Never even run into a bug or crash, just thought they might be some nice additions. Of course, too many 'nice additions' could really bog down the software, and that wouldn't be good for something so clean.