I know we can transform each object instance by using matrix, but this is inconvenient. Even though appleseed is not 3D model software, I think It should have widgets to fransform object instances in the scene by using mouse to drag or something like this.
In its current form appleseed.studio is not really an end user tool and far from a 3d-content creation application replacement. That said, it is very useful for developers, scene inspection and allows access to some features which are not exposed in the render-plugins.
Having widgets to transform object instances would be useful for sure but with the limited developer manpower we have it was so far not a priority.
@shengfu_zhai yeah, I think this has been told several times before. Please for better user experience pick one: Blender, 3ds Max, Maya, all of those are free. Cheers