If you're scanning many frames from the same roll of film, the following procedure will optimally set the CCD exposure and film color (i.e. mask color):
1) Set "Device|Media type" 2) Insert film with clearest area 3) If "Device|Lock exposure" visible 3a) Clear "Device|Lock exposure" 4) Press "Preview" button 5) If cropping needs to be changed 5a) Adjust cropping 5b) Press "Prev mem" button 6) If "Device|Lock exposure" visible 6a) Set "Device|Lock exposure" 6b) Press "Preview" button 7) If "Device|Lock film color" visible 7a) Set "Device|Lock film color"Regardless of the lighting conditions, shutter speed and aperture of each frame in the roll, you should use these fixed values for exposure and film color for scanning all frames on the roll of film.
Once you have the exposure and film color fixed, you can scan the whole roll of film with these values. If you're using the same lighting for all the frames on the roll (or a subset of the frames), you can lock the color balance by scanning the brightest frame in the series and then setting the "Device|Lock image colors" option. This will lock the black and white points for the scene, and will produce consistent colors for all the frames in the series. This is also useful if you're scanning panoramic scenes that have all been taken with the same lighting, shutter speed and aperture or if you're scanning a series of studio shots taken with the same lighting, shutter speed and aperture.
Another thing you can do to optimize workflow is to scan to raw files and later experiment with color correction. If you turn on the "Files|Output raw file" option, the raw data from the scanner is written to a series of files when scanning. You can later batch-process these raw files by changing the "Device|Scan from" option to "Disk", and set the "Device|Frame numbers" option to 1-N. For instance, if you produce raw files named scan0001.tif, scan0002.tif, ..., scan098.tif, you can re-scan all these files without needing to insert the film again by setting the frame numbers to 1-98 and then using the "Scan" button.
If you're saving raw scan files, you probably will want to turn off the "Files|Output TIFF file" and "Files|Output JPEG file" options. You may also want to capture the entire scan region instead of the auto-cropped region by turning the "Crop|Auto crop" option off and setting the "Crop|Crop size" option to "Maximum".
If you set the "Device|Lock exposure" option and turn off the "Crop|Auto crop" option, then the "Scan" button won't first do a preview scan. This can save time when batch scanning.