Long works on creation of analogue of the manipulator iDrive for e39 are completed by me & my friend
Will work on any BMW with iBus the trunk (e46, e38, x3, x5, z4), but it is concrete under e39
the Controller completely duplicates functions right encoder on the monitor + duplicating buttons are added:
MENU
RADIO/TV modul
MODE + one button is left under is functional-programmed on the future
There Is an illumination of buttons and rings iDrive on light-emitting diodes of BMW Itself
Metal крутилка - from e90, the rest- individual workig

Some pictures: