I don’t really see the point of this. Your examples are focussing on roads. Data Users can already focus on the oneway tag only there. For mappers there are other already existing clues:
Just map the signs for this, I already solved discussions that way. Having a tag along that way is also insufficient since the usual debate is from where to where the oneway goes and what routes are affected. A tag along the way does not help over the normal oneway tag.
These shouldn’t be oneways in the first case. There is nothing in affect along the way, someone can park his car 1 cm behind the sign and then start in the other direction again.
I don’t see the advantage here either, especially since you already list other tags that are in use and say the same.
My main problem is that I don’t see the issue you are attempting to solve. Maybe some specific examples, eg. how this would make clear that a sidewalk is oneway only for bicycles would help.
