Selection order now guaranteed as user intended. User must give it zero thought. The selections are all timestamped 100% automatic as if it was a special picker-mode (but it is not).
"I think it's strange you didn't get the "close" tubes with correct vertices"
That's a long standing shape extruder bug. So it is separate from making the cardinal_spline ... but yes ... if I'm making more tubes and wanting to share ... it surely needs fixing soon.