not sure what the issue is but I can say that WoW does indeed scale ui to non-standard resolutions...sorta. When I say sorta I mean I can set ui scaling and then manually expand the wow window to a new resolution by dragging one of the corners, the resolution changes and the ui scales with it (did it on my main last night because it was just too small). Im not sure how it would react by setting the resolution in the config file beforehand though.