But I am often working with many layers, imported from various sources. I want to scale them up using Nearest Neighbor (it's pixel art) but the only way to do that is opening a new pixelmator document for each element, resizing it there, copying it, and pasting it into the final document. This is a very slow workflow.
It would be nice if we could have an expandable or popout configuration here that lets us choose the scaling algorithm when resizing the layer.