A new Enable Shape Angle Constraints option in the Snap Options lets you define your own angle constraint to better assist you with angle snaps (when holding Shift or Ctrl) while creating lines or line objects.
A new Enable Shape Angle Constraints option in the Snap Options (Tools > Grids and Snaps > Grid and Snap Settings > Options panel) lets you define your own angle constraint when creating a line object using the Create panel or the Create Line operation in the Editable Spline or Edit Spline Modifier. Previously, holding Shift (absolute values) or Ctrl (relative values) constrained line creation to 90 degree value changes. Now, the default of 15.0 degrees can be changed to any value or turned off altogether to customize the snapping used to constrain the line creation.