Scalable Terrain Model (STM) from OpenRoads Designer Terrain

I'm finding as I continue to work with OpenRoads Designer (Connect 2018 Release 2), that it would be helpful to export a Terrain to an STM. 

The functionality of the STM seems to be helpful in many ways, including being able to generate simplified contours to reduce the processing requirements during the design (using a Terrain and switching contours on and off, especially if the terrain isn't clipped extremely tightly to the corridor, seems to cause huge amounts of lag and high probability of crashing and other instability). It would also be helpful to convert point clouds to STM without the Quick Ground Extraction for LiDAR data that is already processed.

I also work within stream channels, floodways and floodplains and need to export design features for use in ArcMaps for use in HEC-RAS and similar hydraulic modelling.  Currently only STMs are eligible to be exported to Raster formats for use in Arc/RAS. 

Is there a way to add those functions to the designer workflow for Terrains, or at least to allow Terrains (including complex terrains with design elements incorporated into them) into STM for interoperability with other platforms?