FM, can you elaborateon what you are looking for?

In both of my E53s, the 2002 and 2006 models, I have an A/C button that says "MAX". When engine is running (and other criteria are met), when I push "MAX", I get the full speed fan, with the temp settings and the air circulation set for the maximum performance.

Once the engine is off (and other criteria is met), and I have the car key in my hands, if I press the "MAX" button, I get the residual heater turned on, long enough for a quick errand to a convenience store to pick up a doughnut or whatnot...

The "MAX" button operates identical to what the "REST" button used to do in my E39 - it just bears different name...

Do you wish the "rest" function to activate automatically upon removal of the key from the ignition?