Dungeon difficulty slider

I was wondering, why not put in a dungeon difficulty slider (like the one you get for leves) for pre-made groups that'll let you do the same dungeons as always, only make it harder (and more rewarding of course)?

So instead of AK, you could do AK+3 and get AK+3 gear, that is, if you don't get torn apart by the insanely buffed up monsters.

Most people are probably already sick to death of AK.

So don't do AK. Do Wanderer's+4 or hell, even Titan+4 if you're up for it.

I am liking the idea of difficulty slider for Dungeons. Not saying the Dungeons are difficult, but having options is nice for newbies and veteran players.