While it is certainly possible to implement "reverse translators" for IDF to OSM conversion, it is a very complex task and is not a high priority for DOE. The development team is for more focused on improving the coverage and robustness of forward translation to EnergyPlus and other simulation engines, and enabling the rapid creation of new user interfaces for them. I will update this answer and the OpenStudio development roadmap if that priority changes, but there are no plans to create that functionality at this time.