Icons in Revo#

Wondering what's up with Menu icons. I notice that many (all?) of the ones listed in System Actions in the Top Menu tree don't point to actual image files and when I tried one of my own for a CMP, it didn't appear. Are these deprecated, or to be implemented later, or what?

It's deprecated, or rather - not used in the current design. I assume other mgr interfaces, should they want to, could use the field.