Auto Connect:
When selected, a dialog box will appear.

Auto Connect Error:
If the distance between two curves’ starting and ending points is less than the parameter set, the two curves will be joined into one.
Break cross point:
When the user clicks curve editing->break cross point, the following dialog window will pop up as Fig.

The length of the cross point means the length of the cross line part that we designed.
Related:
How to draw curve text in Ezcad?
How to Draw/Delete/Close/Add Curve in Ezcad2?
Edit Menu: To Curve, To Dashed