1. I don't know if this issue is on Traktor's side or Pioneer's side, but it looks like there is no soft takeover in HID mode. Though you can go to Traktor preferences > Loading and uncheck "Reset all deck controls when loading track" so the pitch fader isn't reset when loading a new track.
2. This is normal, it mimics the small loop when pausing a standalone CDJ in CDJ mode.
3. They don't work because Traktor doesn't have these features.