I just noticed that if you drag&drop models into the view or the reference dialog and use the 'recommended' referencing setting the visible edge setting for 3D attachments is now set to 'CachedAlert'.
I also found that a new variable MS_REF_VISEDGE_ATTACH_STATE may set this back to dynamic, but it does only work for referencing 'interactively'. Does anybody know how to set the default for 'recommended' drag&drop referencing?
MS_REF_DEFAULTSETTING have been considered as alternatives, too, but there is no documented setting for 'visibleEdges'.