Page 47 of the 2011 MY F01/F02 manual says the following:
"Briefly press the switch twice in succession in the desired direction (past the resistance point). The glass sunroof and sliding visor move together. Pressing the switch again stops the motion."
So, I'm guessing you could double tap in the "open" direction, then tap again when the sunroof and visor reach the 1/2-way open point.
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Past: 2008 M3 (E93) naturally aspirated V8 realness!
Past: 2012 740Li (F02) M-Sport (European Delivery)
Present: 2016 750i (G12) M-Sport
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