- tooltips everywhere is planned. most code is written, but tooltips themselves are not. ;)
- That's an interesting upgrade for the scratches node (it would be a couple new "randomness" parameters that affect length and width, so the new node remains compatible with older graphs).
- the rendering resolution is the one on the screen for 2D views and the output resolution for the 3D views.
- zooming in/out 2D preview: not yet, but planned.