I looked at a dozer once with only up down hydraulic. I vaguely remember I could adjust tilt manually. I commented I would prefer a 6 way blade. He said "All you gotta do is back up on a rock to get started, then it cuts the road to shape."
I believe it can also be done backing off the edge of the road to start, come on diagonal. Even a 6 way blade, you run the edge parallel to the tracks as soon as the road under the machine is tilted.
I believe a six way blade is useful, but not essential. Angling the blade is not often used. Angle the blade more than a little, I can't see the corners of the cutting edge. My friend is magical on a small dozer, he explains angling the blade slightly avoids the digs & humps you will create affecting both tracks at once. Next pass angle the other way, tends to reduce the digging & piling.
Tilting the blade only happens at first when you crown a road. As soon as the tractor is tilted one side of a road, you go back to parallel with the tractor.
I have friends, they are highly skilled people. They get the job done with the machine that is there. Kenny, (61 years of age) is still a kid in the eyes of his father (82 years), can do more with a machine than I could believe. If they had a track loader on site, they would crown a road. If a dozer with a 6 way, it'd be more efficient. Each project brings 8? 12? machines. They do the job, ever conscious of the cost of bringing, then removing each machine.
One special tool is some of the International Harvester track loaders (175) in the fleet had Drott Skid Loaders. A Drott bucket allows you to doze & load.