Unstuck is simply a feature of 2.0, and while it is similar to death warps it has nothing to do with dying, therefore it will remain allowed in hardcore runs.

As for the leaderboard split, I definitely see the point in that, but there would have to be enough interest in both categories for it to make sense. Right now, most of the top runs including the WR in survival glitchless are not played on 2.0, and almost the same is true for hardcore glitchless.

We haven't discussed this internally, but I think it's safe to say that we will think about this more seriously if we get more 2.0 runs.

The mods are still discussion some specifics, but overall you can't do anything wrong by following the rules for the original game.