Hi @Habib ,
You’re right that this isn’t exposed in Honeybee and trying to specify this with additional strings will result in duplicated objects.
For now, the only way that you can change this is to either manually edit the IDF (and then use the “HB Rerun IDF” to run the IDF through EnergyPlus) or you could write an OpenStudio Measure to change this attribute of the OSM (using the “HB Load Measure” component to load it and apply it to the measure_ input of the simulation). The latter will be much more automated and reusable but it understandably has more of a learning curve given that you’ll have to write a little Ruby.