I recently started scanning my old 35mm negatives and slides and use LR to process and catalog them. I purchased a fairly inexpensive Plustek 7600i scanner with Silverfast software, and use 48bit mode with ProPhoto RGB profile. This is about as close to RAW mode as you can get with a scanner. Even inexpensive film scanners use a 10bit/color (30bit) or higher bit depth analog converter, and 24bit scans (8bit/color) are throwing away the extra data. This helps to prevent "gaps" in the histogram from processing, which can cause posterization.
If you plan on doing any scanning in the future, and your scanner and software support 48bit mode, you might want to try using it along with a wide gamut profile like Adobe RGB or ProPhoto RGB. I import into Lightroom and make most of my adjustments there, but find Photoshop's cloning tools better for dust spot removal. I usually do the major spot removal and any cropping or rotation "destructively" in Photoshop, and resave the file. LR automatically updates and uses the new modified file. You can go back and forth between the two applications real-time and with relative ease. That way you can use the best of both applications.
You can also use this method to for further processing of your converted bitmap scan image files.
