Interesting idea! How dependent do you think that's going to be on the driver though, verses the shock performance itself? Seems like the numbers will be off by a lot even if the driver's only off by a few mph over the same obstacle?
The accelerometer would reinforce what the driver is feeling in the seat of their pants with measurable and comparable data. The whole driving test is going to be driver dependent and to me that fact brings a huge flaw to the test. What's the constant variable in this? Shouldn't speed be regulated as well as the course? Speed would be adjusted based off driver ability? I don't mean this against the drivers because we're only human and I doubt anyone doing the test driving is a professional driver or has done a whole lot of test driving like this before.
So, first day driver A steps up to the plate. There's probably going to be some nerves and adrenalin flowing as they prepare for sensory overload, mean while with a camera stuck in their face that they're possibly supposed to speak into about what their feeling. Priority should be on driving and not wrecking but you're asking them to do several things at once while not really focusing 100% on anything. So by the second, third, fourth, (whatever last day), day the nerves and adrenalin lessen and comfort level is raised because they know what to expect and in turn it may affect how their body is feeling things.
And what about the driving? Especially the novice driver? Practice makes perfect and with that comes speed. By the last day the driver may feel "y" set up is "fastest" but was it the shock set up that was fast or the fact that you're getting better at driving down the same course day after day? You're going to learn the course, know when to start braking, when to slide, when to accelerate, smoother steering wheel inputs, etc, and in turn gain speed (mph) which may or may not favor the results of the shock being tested. So, should speed be regulated? IMO yes, as well as the course driven should be replicated as humanly possible to give each shock a fair chance. Will some type of measuring instrument like an accelerometer aid in giving feed back on what the driver is feeling without forcing the driver to lose concentration devoted on trying to maintain control? I think so...