I think it would be an awesome addition to the powder toy to have a customizable Workspace size. This means being able to Change the size of the simulation area to your desire. This would open the door to more complex art, much more advanced electronic creations (more space for components), and much more.
And more lag.
Better optimization and performance patches could fix this. Even if it would cause lag at some points, it would be good to have as an optional feature.
And... for computer resolution?