Just want to know if it is standard for the drivers side window to roll down when unlocking the door with the remote key.
Can I change this function? I don't want that feature when its raining.

 

If you holding the button on the key fob after the door unlocks ... that will open windows and roof. Same with the key - holding in the unlock position will open windows starting with the driver side window and progressing to the others and the roof.

 

I don't hold in the unlock button. Just by pressing it once quickly to unlock the driverside door, it also opens the driverside window. As I double tap the unlock button, it will unlock all doors and both front windows. Roof stays closed. Does this need to be reprogramed?

 

Sounds like a personalization issue for a BMW Center to program. There is no user selectable function for the window behaviour you described.

By default, one must press and hold the unlock for a few seconds before the windows start lowering.

 

I have searched hard and have gotten nowhere. I thought that I should throw it here before I visit the dealer. Thanks.

 

Not normal. Visit your friendly dealer for an adjustment in the program.