FoV restrictor in the study that Waffle posted seems to be a nice idea.
Okay here's a swing at a wild pitch, Since Dale and staff are in development of a software application that would bolster Occulus Rift's marketing potential, a select group may have an argument for discounts
or lease / loan equipment to test HiTech's customers' experience with motion sickness.
This area of scientific study design I am comfortable with. In order to achieve the highest degree of confidence in your results it is imperative to present a design that has the highest probability to produce the effect (in this case motion sickness). Yes, unfortunately in order to test the effectiveness of a deterrent of MS you first need to make some folks sick.
Secondly, you should have a respectable sample of subjects. Any offer from the manufacturer to make the hardware more available, matched with the recruitment of new Aces High beta testers from those already with ownership of hardware would benefit all, including customer, developer and manufacturer, if the study's results are positive.
You also need to have a good plan to eliminate positive placebo responders. Some folks are suggestible to conclusions that something is good or bad for them, even if really they have no different properties to do either.
Lastly, but most importantly HiTech's software need to incorporate a design that theoretically improves the reduction in motion sickness
This can be accomplished by using the method described in Waffle's link, addition on motion blur around edges, framerate differentials, or all or any combination of the mentioned designs and of course any that HiTech themselves have come to in house.