Agreed, this is possibly the only bug so far I have with the car.
In terms of upgrading you may need to change the window switches for starters. Visually, they are the same switches that are used in the Mk 1 C4s and my old VTS had one touch closure. IIRC the switch had a second posistion on the backward press (window up) to close with one touch.
However I would also expect there to be software configuration changes to acomodate things like "anti pinch/auto stop". If the Flair models have the one touch function then there is a possibility that the option can be activated through the BSI (with other changes e.g. switches).