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Paul --
As a general rule you'll get the best and most consistent image quality by basing exposure on the shadow reading. Working backwards from the highlight reading will work well for normal subjects but is unreliable for abnormal conditions.
1. If you took one normal exposure, then increased it by a couple of stops for a second shot, then developed both films for the same (or similar) time, you'd be using different regions of the same film curve (same gradient). The negatives might yield similar prints but at different printing times. Shadow rendering might be noticeably different; highlight rendering might be similar. For other exposure comparisons the results are unpredictable.
2. No, I would not consider this to be a good way to test development because it's based on guesswork. You might find it satisfactory for some conditions, though, because the photographic process has considerable latitude and "close" is often good enough. But this is antithetical to BTZS so I can't really advise you.
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