Thanks for reporting the issue. The video closing issue is a known bug on the Quest2. I'll try to fix it when I have some spare time.
Hand tracking will be added with the big UE5 update. Can you explain what you mean by setting a default source and opening the web page? If you type in the website followed by "/heresphere", and then bookmark that url, then the web API for that page will automatically load when you click the bookmark.