I'd like to add steps to areas of my trails which are steep, however, I have no way to align the resulting objects with the spline. This ability could also be used to place things like bridges, gates, or other game object details.
It would also be great to be able to place things like gaurdrails or fences alongside the road as well, but parallel to the spline, rather than perpendicular.
The most flexible approach would likely be to align the objects with a angle offset from the spline's. So zero would be parallel and 90 would be perpendicular.
Simple visual: https://i.imgur.com/ntKtUZ1.jpg