Pitch control would be nice, but camera zoom especially. I can't believe Stencyl doesn't have this yet. You say you have a working version - have you shared this method anywhere? I've been on the lookout for a solid zooming method but haven't found anything.
What I would like to see from Stencyl in 2017 is for a lot of the basic features found in extensions to finally be built in. For example, the functions in the easy math extension, joints, raycasting, scaling blocks, and basic positioning blocks (being able to center an actor at a point without subtracting half-widths and all that nonsense). Oh, and labels. I wouldn't consider it extended functionality to be able to fade/tween text. It's used all the time, so it should be built in. I mean, how hard can it be to add these into the engine?