Advanced control of the render path

There are a bunch of really great settings under “armory render path”, but not quite the options I need.

For one, it’d be nice to be able to set the render and display resolutions independently. You can SORTA do this with the “resolution” drop down, but it only offers some preset options (I’d like to render at a rather low resolution, and nearest-neighbor it up to whatever the display resolution while letterboxing as needed to maintain aspect-correct pixels)

Is there a more advanced way to edit things on this front? If possible, it’d be great to avoid writing shaders (Maybe some kind of node path?) but that may be the only way to actually get some of the effects I want (dithering, for example)