You need to go into a hex editor to the lines DAF53 & 58 and change the values, you can't do it in the ini.
I don't think it goes to 4k, but there are some improvements such as less jaggies in some places. It looks like it broadcasts to a bigger window, then things get a bit crisper when that window is shrunk down (in my case by borderless gaming). The startup text is sharper for sure, then some things in gameplay are less jaggy but not everything and often not by much. Would be good if more people could test it - also there's no reason not to if you have a 4k screen because it doesn't affect performance (that I noticed).