For AC20 (not sure which version you are using), you can use "Identification and Property Label 20" that allows you to select Frame Shape, disable Leader Line, etc. Being a label, it will show/hide with the wall associated.
Or, if you are one of the brave souls, I have a custom made label for you to try. It's still in beta though.
http://palawat.net/blog/palawat-symbol-label-suit-20/