I prefer it in those conditions. Vehicle stays in two-wheel (one wheel if open diff?
) drive mode until it is slippery all the time then into 4WD AT MY CONTROL and stays there until I decide it's time to turn it off.
Speaking of open diffs, I once had a '65 Ford Custom sedan with a slightly siezed crown gear. It was almost like having the rear (and only - it was RWD) differential locked. The back end would be loose on anything as slippery as a gravel road or any surface that was more slippery, e.g. a snow covered road. It was great fun and no problem for the driver; the passengers didn't like it much (except for my wife who soon got used to it).