I pose that, limiting the locations where the player may save, would greatly limit save scumming in general. Perhaps not anywhere in a dungeon, perhaps simply not in a dungeon - regardless, I believe that being able to save whenever and wherever causes gameplay to suffer. The value of randomness and risk is negated and the player is encouraged to deny his own choices (and, therefore, become strangely selective of what constitutes a 'fair' game or not).
But of course, that causes another issue. What if someone happens and you've got to stop playing the game? Well, for that I suggest a second form of saving - a save&quit - that boots you from the game and can be used at any moment. Maybe even during combat.
Feel free to flame me for this idea as much as you like, but I'm not selling this as gospel. I do question wether save scumming should be minimized or not, and would like to know what you think about it.