If there are no uneven cracks or lips to catch, just run the blade in the normal manner. I have a blacktop drive. Blade or no blade, drive gets sealed every few years anyway, and sealer isn't that expensive. Bout $1 per yard for it to be professionally done around here.
Nothing scrapes the hard pack, like where tires run, or when it warms just enough to class over, like the steel edge of the blade.
Some use a slit piece of pipe, some run blade backwards, some use a poly or rubber edge. But nothing will do better and last longer than running the blade with a steel edge forward.
As with anything, there are trade offs. So you have to decide what is most important to you....a clean drive that might have some scratches. Or a unscratched drive that you can stretch another year out before resealing, but not as clean in winter.