Drum scanning negative film, especially B&W, is somewhat different than scanning trannies. All drum scanners and their software are optimized for trannies because the advertising / magazine market dwarfed all the other markets, and art directors demanded the WYSIWYG nature of trannies -- for them, time is money and the ability to toss 'em on the light table and make quick decisions was paramount.
That said, there's a sub-class of drum scanners (so-called table top scanners) that were aimed at smaller pre-press houses that required more versitility. These scanners usually have software that is considerably more "negative friendly" and thus make it possible to deal with negatives (color and B&W) effectively.
Finally, there's a sub-sub-class of drum scanner operators who have the right equipment, the interest, and the experience and who enjoy the challenge of scanning negatives and understand how to scan them to bring out their best. I like to think I'm one (thanks for the plug Pellicle). I know Danny Burk up in Indiana and I've seen his work which is quite good. And there's Lenny Eiger out in California who knows his way around negatives too. Oh, and Tyler Boley in Seattle who is the best B&W inkjet printer I've ever seen -- you wouldn't believe his prints, and he drum scans his own 5x7 B&W and customers' film too. Sadly I don't know anyone to recommend to you in or near NM however.