This is a Blender Add-on that adds Unreal Engine Material Editor style hotkeys to the node editors.

The default controls are:
1, Value
3, RGB
A, Math Add
M, Math Multiply
S, Math Subtract
D, Math Divide
O, One Minus (Subtract node with 1.0 default value)
I, Image Texture
L, Mix Node

This Add-on may interfere with default shortcuts.