I did some searching for this topic, and found some mention of this from some time back, but nothing current. I would find it extremely useful to have the ability to create a construction plane that is normal to a construction axis, with a menu command. I find that I can create a point on a plane where a construction axis intersects, and that is very useful, but I would like the ability to create a work plane that is square to a construction axis, in the absence of other geometry to easily work from. In my case(s) of late, there is no orthogonal relationship to the origins of the rest of the design.
The default operation I think could be:
-select "Plane Perpendicular to Axis"
-pick the axis
-enter
and a work plane appears at the end of the axis closest to the selection point. A very useful extension would be to select a point on the axis at which the plane will be generated, but sometimes there is no point pre-existing, and I do not know of any ability to place a point on a construction axis in the absence of other geometry. That would also be highly useful, but requires another posting, I suspect.