It is missing in AC 12 too. I wrote the attached part to address the issue. Note that this does use the Graphisoft macro "Marker Link Parameters". I don't know if this has changed in any way for AC 14. If so, it might cause problems.
Erich
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K
Duane, There is a double flag option if that is what you mean. But this is a new object not a rewrite of GS's detail marker, nor a rewrite of their macros.
Erich
AC 19 6006 & AC 20
Mac OS 10.11.5
15" Retina MacBook Pro 2.6
27" iMac Retina 5K