I suppose this is about the current smart tv preview (e.g. on vizio, webOS or Samsung devices). Is that correct and if so, on what specific platform do you experience this issue?
This should help properly assigning your issues.
There’s already an existing feature suggestion for some sort of lip sync / audio offset.
The same goes for auto-creating chapters (even if this one doesn’t have much attention and no votes):
As for that my preference would be to move this as an issue report to the right player preview category (also to stick with our forum guidelines to avoid redundant / duplicate feature suggestions that distract votes as well as limiting suggestions to 1 per post to avoid missing critical elements).