1. Well, it works, but I personally find the text is best with it off to my eyes. Scaling at 125%, putting it at 100% makes it too small.
2. This is more of a W10 question. Yes, W10 will allow you to setup Cleartype for individual displays.
3. Hmm...tried the input lag test with my other...
I just got one of these from Korea. No dp. Whites isn't very uniform, not that obvious in normal usage though.
Only have a GTX970, so obviously 4k gaming isn't gonna run well hehe. Comes with a TV remote with korean words, but all you need to know which is the power, menu and directional...