COGO Traverse Tool in ArcMap does not need a drop-down to select between line and curve entry, etc.
It should all be there all available already in the one form, similar to how it was in ArcGIS 8.x. If lines and curves were both already available, then as folks enter bearing and distance, or chords, radius, length, etc. they would not have to have their hands leave the keyboard, going back and forth between mouse and keyboard, switching between lines and curves.
