Ah yeah i see. Well, i agree it could be useful. For the time being, if you just need to have the thumbnail view without all the symmetry extras ect, i think you might have to write the addon by yourself. I could write it but iām already working on my addons at the moment. Unless you can wait few days. If you just need import i (or you) can take some code from my CurveLib addon and adapt it.
Just get in touch if you need something 
Edit: Maybe Asset Flinger or Simple Asset Manager supports FBX/OBj ?