Feature Request: Line Perpendicular to a Curve

I wish that Rhino has some way so giving preference to a curve for drawing a line perpendicular, such as using the selected curve.

Problem: If I have a curve and a marker to indicate where I want to draw a line perpendicular (e.g., line, point), Rhino wants to use the marker to draw perpendicular.

Hello- use the OnCrv one-shot osnap for this, or the PointOnCurve option in Line > Perpendicular.