Or put some decent tyres on?
Mine used to spin the front wheels away from traffic lights on an even slightly wet road without careful finesse of the accelerator.... and that was with plenty of tread depth. Since I swapped to Michelin CrossClimate+ I can (at least straight ahead) floor it from stationary while the front wheels are standing in a puddle with zero wheel spin or drama. Wet roads just feel like dry roads to drive on the wet grip is so good. And unlike finessing the accelerator pedal gently I can also stop that much better in the wet.
The factory Dunlops are dangerously unsafe in the cold and wet IMO. I have so much more confidence in the car in the cold and wet now with better tyres.
Yes, the Eco kickdown feature is not very safe to use in low traction conditions - it's a bit like kicking down a powerful petrol auto in slippery conditions - if it kicks down one gear you're OK, if it decides (at it's whim) to kick down two gears instead you could be in a world of wheel spin...
Better tyres does help a lot but I choose not to use the Eco mode and just be careful with the accelerator when I need to, unless its super slippery like ice. Eco takes all the life out of the car and makes it unpleasant to drive IMHO.