Thank you for the feedback.
Would you please share with us a video that has a lot of flicker on Quest at email@example.com?
Our engineers will check the issue.
For the missing configuration options, the reason is that the PC version has less feature than the mobile version now. By using Oculus Link, Oculus Quest becomes a PC version. We will updated these options to PC version in our next released version.
Thank you and looking forward to your email.