The site just needs drive embeds tbh, they function the same as yt runs in which you don't need to download them to retime.
Probably a little late to this thread, but it would be quite nice to have additional video platform embeds on the site, including vimeo, youtube shorts, and potentially google drive links.
There is the web-based version of livesplit: https://one.livesplit.org/ An online stopwatch: https://www.online-stopwatch.com/
And any system clock should work as well, as they normally have stopwatches that time to the thousandth.
This isn't a thing because you would just time out every time you tried to load that many games. Take seterra for example, just loading the IL page gives a time out, and I can just imagine how bad it would be attempting to search for the letter "T". I would prefer to have a "genre" filter personally, as it would contain more valuable info than an alphabetical sort, but that's just what I think.
A timer isn't required for most games, but you can go to livesplit's website and download the timer from there.