Separate icon area: interface for drivers?

Hi all,

recently I have discovered that the Moncaso 320 display offers icons 
above the text line, e.g. "play", "pause" or "stop". Now I would l like 
to extend the driver to support icons of this kind.

I have found some discussions on this subject, but they are a little 
outdated. Obviously the interface callback function "icon" is the wrong 
function (implements other use case), and the suggested driver function 
was "output" (one bit per icon switches on/off).

Are there any news concerning these "out-of-band" icons? E.g. is there a 
plan to introduce a new interface function handling this icon type?

Regards,
Wolfgang