I followed these steps:
In Unreal Engine 4.11 running on a Mac
LMB + Select a static mesh
Continue to LMB and also press "option"
LMB + option + drag should result in duplicating the static mesh – but for me it just moves the object without creating a duplicate :([details=Summary]This text will be hidden[/details]
never mind fixed it. Not sure how to delete this post.