You added a quick change gear box or tool post?? Tool post seems easy and well worth it, gear box sounds hardI added a quick change to mine. Really nice upgrade. Required really. There's some photos on here about it. Yes feed and thread rods are separate but attached to gears so the ratio installed governs the feed speed. It has powered cross slide which is nice too.
I'm actually quite pleased with it. I've done some good stuff and it's a great unit to learn on. Any issues are really pretty minor.