2) A graphic window to visualize the input/output functions values (numeric digits) of controller.
3) Rotating canvas around the mouse position OR Show the rotation center when rotating canvas (when press "R").
4) Copy and Paste the nodes of a controller.
5) More Shape types
6) Scatter min value (?!)
A tip for tablet without Tilt:
With the brush Felt Pen 4px (and other brushes too)
Set Size Min = 2 (instead of 0) and Size Max = 6
I have a lot of fun with BlackInk

P.S. Where i can find some documentation about the Brush Shader Language ?