My comment wasn't about fighting over the controls in a crosswind - it was about ASSISTING to keep the wings level taxiing, or early in the take-off run, or after landing and slowing to a walking pace - in other words, getting them to do what they are being paid for. In a jet or an ATR you can put a gust lock on for ground taxiing ops, not so in a Twin Otter. Twotter wings develop lots of lift, thats why the aircraft is STOL, and if one is getting more airflow over it at slow speeds - of course it will displace upwards. If the other pilot wasn't there at all then you would be following single-pilot procedures from the Ops Manual and wouldn't be expecting cooperation..
Read the post twoboobs, there is a world of difference with your perception, confusing rudder and tiller use, with aileron displacement.
Sorry to have to spell it out, I thought you were a pilot..