That is, unfortunately, one of the things that keeps me from fully enjoying NWN1. I haven't seen any satisfactory font replacements for 1920x1080 because it's hardcoded. From what I've seen, all you can do is maximise the used space in the font bitmaps to make the letters as large as possible, but the ones I've seen were all blurry, which replaced one kind of illegibility for another. My solution was to reduce my screen resolution.