I bet I'm far too late, but I just wanted to share my idea.
In one of the very early posts, there was a suggestion about digging. I think its a good idea, but as someone said, it could be used to skip through things and fall into voids. Well I thought of something that could be added to help with the digger. In the Knytt Stories level editing program, there are things to make where you can walk through walls if you have the eye (I think so at least. Its either that or the lines you can see with the eye can be used as a hint), where you can give off a teal colour with the Detector, and something that prevents climbing walls.
Well my idea is having one of those things, but instead of a space where you can't climb, it makes you able to dig through walls, terrain, ect. So it would be like the No Climb/No Jump/Sticky.ect squares in the banks in the level editor
I hope I'm making sense. It seems to make sense to me. If someone already put something like this, I'm sorry, as I hadn't seen any with this idea, so if there is a post like this, I must have accidently missed it.