Mapping complicated buildings in iDeditor

Hello. I do validating work for HOTOSM and review mappings from new mappers. mosty mapped in iDeditor,
In JOSM you can map a building with a curved wall or circular corner by mapping a square and a circle. After that they can be merged.
I looked everywhere for something simular in iDeditor, but can find nothing.
I advise often how to map objects, and it should be helpful if there is a possibility to map these objects.
Can somebody help me with this ?

In iD you can square the corner, square the building or make a circle, but you can’t circularize the corner.