In order to make import of 3D equipments and some basic geometry possible in synchro control project, why don't we add a equipment library by default to documents tab. This will enable user to add required equipment files to itwin bridge seamlessly. Some basic shapes like cube, sphere, pyramid etc to added to library to show temporary item. These geomtery can be scale to meet required dimension.
Thank you for your idea. We understand the desire for it and will consider it as a part of a future release.