Instead of using the vertex type you can use material IDs assigned to the base spline's segments to add as many types of corner segment as you need. To do this you'd follow these steps:
- Add your corner segment geometry to RailClone in the usual way.
- Create a Selector operator and wire the corner segments to it's inputs. The order is important as it represents the IDs you will need to allocate to the spline to pick a particular segment.
- Change the Selector operator's mode to Spline Mat. ID
- Select the base spline, go to the segment sub-object level and assign material IDs. RailClone uses the material ID of the spline segment that comes before the vertex.
I've attached a demo file of this set-up.
I hope that helps, please let me know if you have any further questions.