To address your question, the quality score only looks at PIF and given the poor score your PIF would have in any drive made for scanning I would have to say it does. You need to divide these numbers by some constant if you want to compare them to a real scan and even then you will find a significant variability.
All things considered, I would reduce the scan speed to 4X and rely on the job Eric did with CDSpeed to get it to work with ROM drives. In this case that means concentrating on the quality score.
I have burned more R03 than I care to think about; I would say if you stay at 8X with your BenQ and if the R03 is from one of the good batches you will have very good burns. If you have some of the poorer R03, it is still good enough. The bad stuff scans with low PIFs and the PIEs are from 50-100; the good stuff has PIEs in the teens. They both have a very high error count, however.