#2 Can you connect in-ear headphones (or any headphones) to the Oculus Rift S?
Yes you can, there is a headphone jack on the side of visor. However, the cord will have slack and dangle loosely, which can be irritating if you quickly move your head around. I just ran my headset cord to my PC's headphone jack and changed Windows and the Oculus software to use it instead of the Oculus speakers/mic.