One reason why KE engines do not exhibit good cold starting in mild weather is because the cold start valve DOES NOT add fuel unless the coolant temperature is about 5C or below( This may vary with model/engine). Conversely they will exhibit better cold start behavior at 5C or below because the cold start valve is adding fuel.

The temperature at which the cold start valve is activated and adds fuel is well below the cold start temperature for emissions certification, and I have no doubt this is intentional.

Duke