Dunno about the dihedral, but in a banked turn with the crossflow open it can move quite fast - faster still if cross controlled....60 degree bank angle: yikes!
Was possibly a factor in a crash here in the US.
Limit imbalance 500 lbs in the 14.5 and 400 if under 2,000 lbs total, or 200 if over 2,000 lb total in the 16.0.
Have heard a 1,000 imbalance being controllable, but tough. also heard the fuel vent lines can fail, causing uncommanded transfer.......
Just as well we have no autopilots in our birds!