I also wanted to implement another feature...
But alas, experiments showed that the sweep function (using MoI3D's mechanics) imposes limits on the distance between the profile's center (a circle, in this case)
and the polyline's starting point; if the center is too far away, the system doesn't recognize the circle as a valid object for the sweep.

It’s possible I misunderstood something, but unfortunately, it doesn't work the way I want it to, so I’ve excluded this functionality from the current version of the plugin.
The idea was for the plugin to create copies of the profile (the one "traveling along the rail") in the form of a controllable array.

If someone manages to pull this off in the end, that would be awesome.