Vanos - BMW's variable intake / exhaust timing system.
My engine uses Single vanos, which only advances the intake cam.
From here: http://www.bmwworld.com/technology/vanos.htm
Just off idle, the DME energizes a solenoid which allows oil pressure to move that cup gear to advance the cam 12.5 degrees at midrange, and then at about 5000 rpm, it allows it to come back to the original position.
To impliment in VEMS, we need to have an RPM based off-on-off.
From my understanding, currently the firmware can only handle an off-on situation.
Dual vanos changes both of the exhaust and intake cam timing, and is variable throughout the range (not on/off like single vanos). This would require a much more complex PWM system to control.
There is no need for firmware changes to support single VANOS, use one of the misc output functions to be active within a certain RPM range, you may have to use the inverted function on the output depending on the logic function of the VANOS solenoid.