I think this is a good idea to add these controls in Arkio one day but we also want to prevent cluttering of import settings with many settings that are hard to understand by non-experts.
Since many 3D modeling programs choose different coordinate systems it is often easiest to correct your orientation for the desired program from the source software. When using our Sketchup/Rhino/Revit plugins we rotate the model to the left-handed Y-axis up coordinate system similar to Unity.
In most 3D modeling tools upon export, you can choose to set your desired axis. If you want to export models from mesh tools like Blender you can use the following export settings:
If you don’t want to be bothered too much by these settings you can also just bring in your models in the coordinate system that your software uses and then correct the rotation in Arkio by picking up the geometry with your hand and rotating it correctly and then pinning it.