Premiere should not automatically modify the DV video you capture. If the video appears too dark, it probably only has to do with the way your computer displays it (overlay video). If you were to use an external monitor (or output it back to tape), you would see the video is identical to the original source. You might want to check if your video card lets you adjust the brightness of overlay video.
As for capturing the first 2 seconds of tape footage, have you tried capturing manually instead of batch capture? Batch capture isn’t recommended for the first 5 seconds, so I usually capture those manually. But the best advice is to always let the tape roll for a few seconds at the begining of the tape when you shoot.
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JF Robichaud
Low Budget Productions