I'll look into this as you're not the only one who's asked about it, is there a particular upper resolution you'd like to see? I need to see about performance etc, but I'll see what I can do
That should be okay, probably a little slow at that scale, but it'll depend on your specs. I've changed the export dialog so that now the output scale actually renders at the scale/resolution you set (rather than scaling it up/down after), so once I release this update, you should be able to go as high or low as you like