Topgun,
People do it, and are going to continue to park on the highways and Interstates to hunt their public lands, get over it.
If people want to corner cross or park off a highway/interstate to hunt, its absolutely none of your business.
Also, that regulation you posted, doesn't say anything regarding "between the fencelines"...that's you trying to interpret something that's out of your depth of knowledge, just so you can "think" you're "right". About like the advice you've given on unit 16 that you've never held a tag for or even hunted. Honestly, you look rather foolish...but, by all means, carry on.
IMO, it has 100% to do with parking ON the paved road surface, which makes sense. No mention of parking on the actual right of way.
Either way its a common practice in MT and WY, and the more I read, many other States as well.