^yeah!
In episode 2, it would be cool If they could make it so that what happens when you hold in the direction that Sonic is moving also happens when not holding in that direction (especially when on land or when coming off of diagonal springs). However I wonder if that could break the episode 1 zones, in that they were designed with the current system in mind.
Maybe it would be possible to have the episode 2 changes that work in episode 1 to carry over, while episode 1 breaking changes are left exclusively to the episode 2+ zones. Removing uncurling would not break episode 1, however removing physics based on d-pad direction probably would break it.
What I wonder is what they would do if Tails and Knuckles are allowed to play episode 1 stages in the future. Would they tweak the enemy placement so Tails and Knux could come off a slope and fly/glide in areas where Sonic does his homing attack? Knux could manage as his knuckles act as badnik killers, but Tails would probably have to have the air badniks removed.