@geeman1: Barely noticeable difference - yes to the eye and without zoom. But if you actually want to use these screenshots as source for image editing then 80% jpeg quality is horrible.
Also maybe DX8.1 only supports saving as bitmap, but what hinders Scawen from using that bitmap output and converting it to PNG/JPEG himself? I mean, we can read JPEGs and convert them to DDS automatically, so saving as JPEG must be possible somehow, even if it's not directly through DX. The only problem I could see is maybe licensing issues regarding third party image format libraries