I've noticed that turning is very rigid at the moment. When playing with a controller, I can't even tell whether analog input is being taken into consideration when turning. I think it would be nice to implement turn inertia with acceleration, a max turning rate, and deceleration when you let off either the stick or the arrow.
Using the stick could allow you some freedom over holding your turn at a slower than max rate. Keyboard users could just tap the arrow repeatedly to turn slower.
I feel that this would add more of the arcade feel to the game, and I think it was in place in the original, though my memories of that time are a bit vague.
At any rate, it would allow for taking out rocks that are so close to one another in one smooth motion.